{"id":20002,"date":"2022-10-09T15:57:33","date_gmt":"2022-10-09T13:57:33","guid":{"rendered":"https:\/\/g100.us\/?p=20002"},"modified":"2023-05-05T16:09:36","modified_gmt":"2023-05-05T14:09:36","slug":"what-is-pc-post-posting","status":"publish","type":"post","link":"https:\/\/g100.us\/what-is-pc-post-posting\/","title":{"rendered":"PC POST \/ POSTing explained and Guidelines to fix Power-On-Self-Test Errors"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_39 counter-hierarchy ez-toc-counter ez-toc-container-direction\">\n<p class=\"ez-toc-title\">TABLE OF CONTENTS<\/p>\n<label for=\"ez-toc-cssicon-toggle-item-668454c65df6f\" class=\"cssicon\"><span style=\"display: flex;align-items: center;width: 35px;height: 30px;justify-content: center;direction:ltr;\"><svg style=\"fill: #7f11e0;color:#7f11e0\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\" \/><\/svg><svg style=\"fill: #7f11e0;color:#7f11e0\" class=\"arrow-unsorted-368013\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\" \/><\/svg><\/span><\/label><label for=\"ez-toc-cssicon-toggle-item-668454c65df6f\" class=\"cssiconcheckbox\">1<\/label><input type=\"checkbox\" id=\"ez-toc-cssicon-toggle-item-668454c65df6f\" checked><nav><ul class=\"ez-toc-list ez-toc-list-level-1 \"><li class=\"ez-toc-page-1 ez-toc-heading-level-2\"><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/g100.us\/what-is-pc-post-posting\/#What_Does_PC_POSTing_Mean\" title=\"What Does PC POSTing Mean?\">What Does PC POSTing Mean?<\/a><\/li><li class=\"ez-toc-page-1 ez-toc-heading-level-2\"><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/g100.us\/what-is-pc-post-posting\/#POSTing_and_the_Role_of_the_BIOS\" title=\"POSTing and the Role of the BIOS\">POSTing and the Role of the BIOS<\/a><\/li><li class=\"ez-toc-page-1 ez-toc-heading-level-2\"><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/g100.us\/what-is-pc-post-posting\/#Which_Tests_Are_Involved_in_the_POST_Process\" title=\"Which Tests Are Involved in the POST Process?\">Which Tests Are Involved in the POST Process?<\/a><\/li><li class=\"ez-toc-page-1 ez-toc-heading-level-2\"><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/g100.us\/what-is-pc-post-posting\/#How_Do_You_Know_If_POST_Has_Failed\" title=\"How Do You Know If POST Has Failed?\">How Do You Know If POST Has Failed?<\/a><ul class=\"ez-toc-list-level-3\"><li class=\"ez-toc-heading-level-3\"><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/g100.us\/what-is-pc-post-posting\/#Error_Messages_Displayed_on_the_PC_Monitor\" title=\"Error Messages Displayed on the PC Monitor\">Error Messages Displayed on the PC Monitor<\/a><\/li><li class=\"ez-toc-page-1 ez-toc-heading-level-3\"><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/g100.us\/what-is-pc-post-posting\/#POST_Notifications_via_Beep_Codes\" title=\"POST Notifications via Beep Codes\">POST Notifications via Beep Codes<\/a><\/li><li class=\"ez-toc-page-1 ez-toc-heading-level-3\"><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/g100.us\/what-is-pc-post-posting\/#Hex_Error_Codes_via_a_POST_Card\" title=\"Hex Error Codes via a POST Card\">Hex Error Codes via a POST Card<\/a><\/li><\/ul><\/li><li class=\"ez-toc-page-1 ez-toc-heading-level-2\"><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/g100.us\/what-is-pc-post-posting\/#Common_Ways_of_Resolving_Errors_Detected_During_POST\" title=\"Common Ways of Resolving Errors Detected During POST\">Common Ways of Resolving Errors Detected During POST<\/a><\/li><li class=\"ez-toc-page-1 ez-toc-heading-level-2\"><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/g100.us\/what-is-pc-post-posting\/#Conclusion\" title=\"Conclusion\">Conclusion<\/a><\/li><li class=\"ez-toc-page-1 ez-toc-heading-level-2\"><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/g100.us\/what-is-pc-post-posting\/#FAQ\" title=\"FAQ\">FAQ<\/a><ul class=\"ez-toc-list-level-3\"><li class=\"ez-toc-heading-level-3\"><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/g100.us\/what-is-pc-post-posting\/#What_Are_the_Requirements_for_a_PC_to_POST\" title=\"What Are the Requirements for a PC to POST?\">What Are the Requirements for a PC to POST?<\/a><\/li><li class=\"ez-toc-page-1 ez-toc-heading-level-3\"><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/g100.us\/what-is-pc-post-posting\/#What_is_the_Difference_Between_POST_and_BIOS\" title=\"What is the Difference Between POST and BIOS?\">What is the Difference Between POST and BIOS?<\/a><\/li><li class=\"ez-toc-page-1 ez-toc-heading-level-3\"><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/g100.us\/what-is-pc-post-posting\/#What_Happens_When_My_PC_Wont_POST\" title=\"What Happens When My PC Won\u2019t POST?\">What Happens When My PC Won\u2019t POST?<\/a><\/li><\/ul><\/li><li class=\"ez-toc-page-1 ez-toc-heading-level-2\"><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/g100.us\/what-is-pc-post-posting\/#Over_to_You\" title=\"Over to You\">Over to You<\/a><\/li><\/ul><\/nav><\/div>\n<p>POST, short for <strong><em>power-on self-test<\/em><\/strong>, is a series of tests and procedures your PC runs through before loading the operating system.<\/p>\n<p>These tests help verify the health of your PC\u2019s components before the rest of the booting process can continue.<\/p>\n<div id=\"attachment_20008\" style=\"width: 2123px\" class=\"wp-caption alignnone\"><noscript><img aria-describedby=\"caption-attachment-20008\" decoding=\"async\" class=\"size-full wp-image-20008\" src=\"https:\/\/g100.us\/wp-content\/uploads\/media\/2022\/09\/POST-screen-on-PC.jpg\" alt=\"POST screen on PC\" width=\"2123\" height=\"1681\" srcset=\"https:\/\/g100.us\/wp-content\/uploads\/media\/2022\/09\/POST-screen-on-PC.jpg 2123w, https:\/\/g100.us\/wp-content\/uploads\/media\/2022\/09\/POST-screen-on-PC-300x238.jpg 300w, https:\/\/g100.us\/wp-content\/uploads\/media\/2022\/09\/POST-screen-on-PC-1024x811.jpg 1024w, https:\/\/g100.us\/wp-content\/uploads\/media\/2022\/09\/POST-screen-on-PC-768x608.jpg 768w, https:\/\/g100.us\/wp-content\/uploads\/media\/2022\/09\/POST-screen-on-PC-1536x1216.jpg 1536w, https:\/\/g100.us\/wp-content\/uploads\/media\/2022\/09\/POST-screen-on-PC-2048x1622.jpg 2048w\" sizes=\"(max-width: 2123px) 100vw, 2123px\"><\/noscript><img aria-describedby=\"caption-attachment-20008\" decoding=\"async\" class=\"size-full wp-image-20008 lazyload\" src=\"data:image\/svg+xml,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20viewBox%3D%220%200%202123%201681%22%3E%3C%2Fsvg%3E\" alt=\"POST screen on PC\" width=\"2123\" height=\"1681\" srcset=\"data:image\/svg+xml,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20viewBox%3D%220%200%202123%201681%22%3E%3C%2Fsvg%3E 2123w\" sizes=\"(max-width: 2123px) 100vw, 2123px\" data-srcset=\"https:\/\/g100.us\/wp-content\/uploads\/media\/2022\/09\/POST-screen-on-PC.jpg 2123w, https:\/\/g100.us\/wp-content\/uploads\/media\/2022\/09\/POST-screen-on-PC-300x238.jpg 300w, https:\/\/g100.us\/wp-content\/uploads\/media\/2022\/09\/POST-screen-on-PC-1024x811.jpg 1024w, https:\/\/g100.us\/wp-content\/uploads\/media\/2022\/09\/POST-screen-on-PC-768x608.jpg 768w, https:\/\/g100.us\/wp-content\/uploads\/media\/2022\/09\/POST-screen-on-PC-1536x1216.jpg 1536w, https:\/\/g100.us\/wp-content\/uploads\/media\/2022\/09\/POST-screen-on-PC-2048x1622.jpg 2048w\" data-src=\"https:\/\/g100.us\/wp-content\/uploads\/media\/2022\/09\/POST-screen-on-PC.jpg\"><p id=\"caption-attachment-20008\" class=\"wp-caption-text\">Image Credit: <a href=\"https:\/\/commons.wikimedia.org\/wiki\/File:POST_P5KPL.jpg\" target=\"_blank\" rel=\"noopener\">Wikimedia<\/a><\/p><\/div>\n<p>Down below, we\u2019ll take a deeper dive into what POSTing looks like, what it means when a POST fails, and how to fix and troubleshoot the most common POST-related errors.<\/p>\n<p>There\u2019s quite a lot of ground to cover, so let\u2019s begin!<\/p>\n<h2><span class=\"ez-toc-section\" id=\"What_Does_PC_POSTing_Mean\"><\/span>What Does PC POSTing Mean?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>A POST is usually the very first process your PC will run when it gets turned on \u2014 i.e. when you press the power button. This holds true for <em>every<\/em> PC, even if it doesn\u2019t have an OS installed.<\/p>\n<p>This process is also incredibly important when <a href=\"https:\/\/g100.us\/how-to-build-a-pc\/\">building a PC<\/a>. <strong>The tests involved during a power-on self-test will let you know if you\u2019ve installed your hardware correctly and provide a roadmap of sorts to help with troubleshooting in case problems are identified. <\/strong><\/p>\n<p>For the person building a PC, POST may come in the form of one or more beeping sounds during startup and just before the OS is loaded, depending on whether the tests were successful or not.<\/p>\n<p><strong>The POST process checks whether your components are in good working condition.<\/strong> This includes your CPU, graphics card, I\/O devices, and any other component that is <a href=\"https:\/\/g100.us\/what-are-motherboards-made-of\/\">connected to your motherboard<\/a>.<\/p>\n<p>If an issue is detected with any of your hardware, the power-on self-test will fail, and the boot sequence will be aborted.<\/p>\n<p>Subsequently, your BIOS will issue one or more error messages in the form of beep codes to notify you that there\u2019s a problem \u2014 the kind that is preventing your PC from booting.<\/p>\n<p>More on that later.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"POSTing_and_the_Role_of_the_BIOS\"><\/span>POSTing and the Role of the BIOS<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Before the <a href=\"https:\/\/www.dell.com\/support\/kbdoc\/en-us\/000128270\/post-and-boot-procedures\" target=\"_blank\" rel=\"noopener\">boot sequence<\/a> can begin, your BIOS first needs to send instructions for a power-on self-test.<\/p>\n<p>If there are no issues with your hardware, the BIOS will load the boot code from your hard drive and then subsequently launch the OS.<\/p>\n<p>Your OS will then launch all relevant drivers and services, effectively ending the booting sequence until you are presented a functional OS.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Which_Tests_Are_Involved_in_the_POST_Process\"><\/span>Which Tests Are Involved in the POST Process?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>POST works <em>procedurally<\/em> when testing and initializing your PC\u2019s components.<\/p>\n<div id=\"attachment_20009\" style=\"width: 2048px\" class=\"wp-caption alignnone\"><noscript><img aria-describedby=\"caption-attachment-20009\" decoding=\"async\" class=\"size-full wp-image-20009\" src=\"https:\/\/g100.us\/wp-content\/uploads\/media\/2022\/09\/POST-Power-On-Self-Test-Hardware-Diagnostics.jpg\" alt=\"POST (Power-On Self-Test) Hardware Diagnostics\" width=\"2048\" height=\"1080\" srcset=\"https:\/\/g100.us\/wp-content\/uploads\/media\/2022\/09\/POST-Power-On-Self-Test-Hardware-Diagnostics.jpg 2048w, https:\/\/g100.us\/wp-content\/uploads\/media\/2022\/09\/POST-Power-On-Self-Test-Hardware-Diagnostics-300x158.jpg 300w, https:\/\/g100.us\/wp-content\/uploads\/media\/2022\/09\/POST-Power-On-Self-Test-Hardware-Diagnostics-1024x540.jpg 1024w, https:\/\/g100.us\/wp-content\/uploads\/media\/2022\/09\/POST-Power-On-Self-Test-Hardware-Diagnostics-768x405.jpg 768w, https:\/\/g100.us\/wp-content\/uploads\/media\/2022\/09\/POST-Power-On-Self-Test-Hardware-Diagnostics-1536x810.jpg 1536w\" sizes=\"(max-width: 2048px) 100vw, 2048px\"><\/noscript><img aria-describedby=\"caption-attachment-20009\" decoding=\"async\" class=\"size-full wp-image-20009 lazyload\" src=\"data:image\/svg+xml,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20viewBox%3D%220%200%202048%201080%22%3E%3C%2Fsvg%3E\" alt=\"POST (Power-On Self-Test) Hardware Diagnostics\" width=\"2048\" height=\"1080\" srcset=\"data:image\/svg+xml,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20viewBox%3D%220%200%202048%201080%22%3E%3C%2Fsvg%3E 2048w\" sizes=\"(max-width: 2048px) 100vw, 2048px\" data-srcset=\"https:\/\/g100.us\/wp-content\/uploads\/media\/2022\/09\/POST-Power-On-Self-Test-Hardware-Diagnostics.jpg 2048w, https:\/\/g100.us\/wp-content\/uploads\/media\/2022\/09\/POST-Power-On-Self-Test-Hardware-Diagnostics-300x158.jpg 300w, https:\/\/g100.us\/wp-content\/uploads\/media\/2022\/09\/POST-Power-On-Self-Test-Hardware-Diagnostics-1024x540.jpg 1024w, https:\/\/g100.us\/wp-content\/uploads\/media\/2022\/09\/POST-Power-On-Self-Test-Hardware-Diagnostics-768x405.jpg 768w, https:\/\/g100.us\/wp-content\/uploads\/media\/2022\/09\/POST-Power-On-Self-Test-Hardware-Diagnostics-1536x810.jpg 1536w\" data-src=\"https:\/\/g100.us\/wp-content\/uploads\/media\/2022\/09\/POST-Power-On-Self-Test-Hardware-Diagnostics.jpg\"><p id=\"caption-attachment-20009\" class=\"wp-caption-text\">Source: <a href=\"https:\/\/www.techtarget.com\/whatis\/definition\/POST-Power-On-Self-Test\" target=\"_blank\" rel=\"noopener\">Tech Target<\/a><\/p><\/div>\n<p>It does so in the following order:<\/p>\n<ul>\n<li>CPU registers<\/li>\n<li>ROM BIOS checksum<\/li>\n<li><a href=\"https:\/\/g100.us\/clear-cmos-motherboard\/\">CMOS RAM<\/a><\/li>\n<li>Verification of the DMA controller<\/li>\n<li>Verification of the keyboard controller<\/li>\n<li>Initialization and verification of system RAM<\/li>\n<li>Verification and initialization of the interrupt controller, interrupt timer, and the cache controller<\/li>\n<\/ul>\n<p>Once the main hardware components have been tested and initialized, the POST will then test to see if the configuration data held in the CMOS RAM aligns with all PC hardware that is physically present.<\/p>\n<p>That process includes:<\/p>\n<ul>\n<li>Verification of CMOS configuration data<\/li>\n<li>Testing and initialization of third-party video controller(s). POST will display the BIOS version, brand information, and available memory for third-party video cards, if available. Onboard graphics chipsets aren\u2019t tested at this point.<\/li>\n<li>Integrity check for plug-and-play cards<\/li>\n<li>Mouse and keyboard test and initialization<\/li>\n<li>Test for circuitry associated with the serial interface<\/li>\n<li>Fixed disk and diskette controller test and initialization<\/li>\n<li>Test and initialization of other hardware, including IDE removable media and CD and DVD ROM.<\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"How_Do_You_Know_If_POST_Has_Failed\"><\/span>How Do You Know If POST Has Failed?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>If POST detects problems at any stage during the testing process, booting is aborted, and POST reports a fault.<\/p>\n<p>Some of the more obvious signs that POST has failed include:<\/p>\n<ul>\n<li>Your PC displays the manufacturer\u2019s logo after powering on but freezes and doesn\u2019t move beyond that point.<\/li>\n<li>The monitor displayed something after powering up <a href=\"https:\/\/g100.us\/fix-monitor-goes-black\/\">but went black somewhere along the start-up routine<\/a>.<\/li>\n<li>If you\u2019re stuck on a screen that displays nothing but some text on a black background.<\/li>\n<li>For some manufacturers, the power or <a href=\"https:\/\/g100.us\/msi-ez-debug-leds-troubleshooting\/\">diagnostic LEDs<\/a> on your PC's motherboard will light orange or amber if there is a POST failure. These lights will also flash to indicate a problem and in some cases, the flashing will be of a particular pattern to indicate a specific problem.<\/li>\n<\/ul>\n<p>More importantly, your PC will let you know POST has failed via a series of audiovisual outputs (If you have an internal speaker connected).<\/p>\n<p>It will either display specific error codes on the screen or send out a series of beep sounds for individual POST failures.<\/p>\n<p>These error codes and beeps are unique to the PC's or Motherboard's manufacturer. Here's a <a href=\"https:\/\/g100.us\/asus-motherboard-error-codes\/\">list of Error Codes you might encounter with an ASUS Motherboard<\/a>.<\/p>\n<p>On macOS, POST errors are displayed in the form of graphics. For instance, if POST doesn\u2019t find a boot device, you\u2019ll see a broken folder icon.<\/p>\n<div id=\"attachment_20010\" style=\"width: 1560px\" class=\"wp-caption alignnone\"><noscript><img aria-describedby=\"caption-attachment-20010\" decoding=\"async\" class=\"img-with-border wp-image-20010 size-full\" src=\"https:\/\/g100.us\/wp-content\/uploads\/media\/2022\/09\/MacOS-POST-error.jpg\" alt=\"MacOS POST error\" width=\"1560\" height=\"950\" srcset=\"https:\/\/g100.us\/wp-content\/uploads\/media\/2022\/09\/MacOS-POST-error.jpg 1560w, https:\/\/g100.us\/wp-content\/uploads\/media\/2022\/09\/MacOS-POST-error-300x183.jpg 300w, https:\/\/g100.us\/wp-content\/uploads\/media\/2022\/09\/MacOS-POST-error-1024x624.jpg 1024w, https:\/\/g100.us\/wp-content\/uploads\/media\/2022\/09\/MacOS-POST-error-768x468.jpg 768w, https:\/\/g100.us\/wp-content\/uploads\/media\/2022\/09\/MacOS-POST-error-1536x935.jpg 1536w\" sizes=\"(max-width: 1560px) 100vw, 1560px\"><\/noscript><img aria-describedby=\"caption-attachment-20010\" decoding=\"async\" class=\"img-with-border wp-image-20010 size-full lazyload\" src=\"data:image\/svg+xml,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20viewBox%3D%220%200%201560%20950%22%3E%3C%2Fsvg%3E\" alt=\"MacOS POST error\" width=\"1560\" height=\"950\" srcset=\"data:image\/svg+xml,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20viewBox%3D%220%200%201560%20950%22%3E%3C%2Fsvg%3E 1560w\" sizes=\"(max-width: 1560px) 100vw, 1560px\" data-srcset=\"https:\/\/g100.us\/wp-content\/uploads\/media\/2022\/09\/MacOS-POST-error.jpg 1560w, https:\/\/g100.us\/wp-content\/uploads\/media\/2022\/09\/MacOS-POST-error-300x183.jpg 300w, https:\/\/g100.us\/wp-content\/uploads\/media\/2022\/09\/MacOS-POST-error-1024x624.jpg 1024w, https:\/\/g100.us\/wp-content\/uploads\/media\/2022\/09\/MacOS-POST-error-768x468.jpg 768w, https:\/\/g100.us\/wp-content\/uploads\/media\/2022\/09\/MacOS-POST-error-1536x935.jpg 1536w\" data-src=\"https:\/\/g100.us\/wp-content\/uploads\/media\/2022\/09\/MacOS-POST-error.jpg\"><p id=\"caption-attachment-20010\" class=\"wp-caption-text\">Image Credit: <a href=\"https:\/\/support.apple.com\/en-us\/HT204323\" target=\"_blank\" rel=\"noopener\">Apple<\/a><\/p><\/div>\n<p>Let\u2019s take a closer look at some of the most frequent error messages and beep sounds to better understand what your PC might be trying to communicate.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Error_Messages_Displayed_on_the_PC_Monitor\"><\/span>Error Messages Displayed on the PC Monitor<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>An error message is the easiest way for one to decode and decipher a POST-related issue.<\/p>\n<p>That, however, only works if the system can load the video graphics adapter attached to the monitor.<\/p>\n<p>If POST finds an issue and the graphics adapter is operational, a text message will be displayed, briefly describing the problem. An error code will usually accompany the message.<\/p>\n<p>For example:<\/p>\n<p><noscript><img decoding=\"async\" width=\"842\" height=\"263\" class=\"wp-image-20003\" src=\"https:\/\/g100.us\/wp-content\/uploads\/media\/2022\/09\/hard-disk-3f0-error.png\" alt=\"Hard Disk 3F0 Error\" srcset=\"https:\/\/g100.us\/wp-content\/uploads\/media\/2022\/09\/hard-disk-3f0-error.png 842w, https:\/\/g100.us\/wp-content\/uploads\/media\/2022\/09\/hard-disk-3f0-error-300x94.png 300w, https:\/\/g100.us\/wp-content\/uploads\/media\/2022\/09\/hard-disk-3f0-error-768x240.png 768w\" sizes=\"(max-width: 842px) 100vw, 842px\"><\/noscript><img decoding=\"async\" width=\"842\" height=\"263\" class=\"wp-image-20003 lazyload\" src=\"data:image\/svg+xml,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20viewBox%3D%220%200%20842%20263%22%3E%3C%2Fsvg%3E\" alt=\"Hard Disk 3F0 Error\" srcset=\"data:image\/svg+xml,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20viewBox%3D%220%200%20842%20263%22%3E%3C%2Fsvg%3E 842w\" sizes=\"(max-width: 842px) 100vw, 842px\" data-srcset=\"https:\/\/g100.us\/wp-content\/uploads\/media\/2022\/09\/hard-disk-3f0-error.png 842w, https:\/\/g100.us\/wp-content\/uploads\/media\/2022\/09\/hard-disk-3f0-error-300x94.png 300w, https:\/\/g100.us\/wp-content\/uploads\/media\/2022\/09\/hard-disk-3f0-error-768x240.png 768w\" data-src=\"https:\/\/g100.us\/wp-content\/uploads\/media\/2022\/09\/hard-disk-3f0-error.png\"><\/p>\n<p>The error code displayed will help you dig deeper into the problem POST encountered. Sometimes no further investigation is needed as the error description is quite straightforward.<\/p>\n<p>For example, the error message shown above says there\u2019s no boot device detected.<\/p>\n<p>This error occurs when the operating system is not able to find the boot sector of your hard drive. The issue, therefore, might be one of the following:<\/p>\n<ul>\n<li>Damaged boot files<\/li>\n<li>Corrupt hard drive<\/li>\n<li>Wrong boot sequence<\/li>\n<\/ul>\n<p>In other instances, the codes can be quite difficult to decipher without digging into further research.<\/p>\n<p>Thankfully, you can always find the problem description in the documentation provided by your PC\u2019s manufacturer if the short error message isn\u2019t descriptive enough.<\/p>\n<p>Other common error codes include:<\/p>\n\n<table id=\"tablepress-179\" class=\"tablepress tablepress-id-179 tablepress-responsive\">\n<thead>\n<tr class=\"row-1 odd\">\n\t<th class=\"column-1\"><em>ERROR CODE<\/em><\/th><th class=\"column-2\"><em>CAUSE OF ERROR<\/em><\/th>\n<\/tr>\n<\/thead>\n<tbody class=\"row-hover\">\n<tr class=\"row-2 even\">\n\t<td class=\"column-1\"><strong>301<\/strong><\/td><td class=\"column-2\">Hard drive failure<\/td>\n<\/tr>\n<tr class=\"row-3 odd\">\n\t<td class=\"column-1\"><strong>201<\/strong><\/td><td class=\"column-2\">Memory failure<\/td>\n<\/tr>\n<tr class=\"row-4 even\">\n\t<td class=\"column-1\"><strong>1101<\/strong><\/td><td class=\"column-2\">System crashing probability, system malfunction<\/td>\n<\/tr>\n<tr class=\"row-5 odd\">\n\t<td class=\"column-1\"><strong>161<\/strong><\/td><td class=\"column-2\">Windows registry irregular entries<\/td>\n<\/tr>\n<tr class=\"row-6 even\">\n\t<td class=\"column-1\"><strong>601<\/strong><\/td><td class=\"column-2\">Battery is dead<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<!-- #tablepress-179 from cache -->\n<h3><span class=\"ez-toc-section\" id=\"POST_Notifications_via_Beep_Codes\"><\/span>POST Notifications via Beep Codes<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Your PC\u2019s BIOS will also use beeping sounds to communicate the progress or failure of POST. This, however, also depends on your motherboard\u2019s manufacturer as some models might not emit any beeping for successful or unsuccessful POST.<\/p>\n<p>Still, the system speaker and associated drivers <em>should<\/em> be sufficient for you to hear these beep codes.<\/p>\n<p>When POST detects a malfunction with any of your devices during testing, it will send a sequence of beeps to indicate a particular problem and then terminate the booting process.<\/p>\n<p>These beeps will vary in length and number per sequence, depending on the type of error.<\/p>\n<p>So, if you suspect that you might have an issue with your PC during POST, keenly listen for the number and duration of these beeping sounds during startup.<\/p>\n<p>Some of the most common POST errors communicated via beep codes include:<\/p>\n\n<table id=\"tablepress-180\" class=\"tablepress tablepress-id-180 tablepress-responsive\">\n<thead>\n<tr class=\"row-1 odd\">\n\t<th class=\"column-1\"><strong>Beep code<\/strong><\/th><th class=\"column-2\"><strong>Cause of error<\/strong><\/th>\n<\/tr>\n<\/thead>\n<tbody class=\"row-hover\">\n<tr class=\"row-2 even\">\n\t<td class=\"column-1\"><strong>1 short beep<\/strong><\/td><td class=\"column-2\">No error<\/td>\n<\/tr>\n<tr class=\"row-3 odd\">\n\t<td class=\"column-1\"><strong>1 short beep and blank screen<\/strong><\/td><td class=\"column-2\">The display card or cable has an issue<\/td>\n<\/tr>\n<tr class=\"row-4 even\">\n\t<td class=\"column-1\"><strong>2 short beeps<\/strong><\/td><td class=\"column-2\">The error code will be shown on the screen<\/td>\n<\/tr>\n<tr class=\"row-5 odd\">\n\t<td class=\"column-1\"><strong>Repeating short beeps<\/strong><\/td><td class=\"column-2\">Power supply issue<\/td>\n<\/tr>\n<tr class=\"row-6 even\">\n\t<td class=\"column-1\"><strong>Continuous beep<\/strong><\/td><td class=\"column-2\">RAM issue, power supply or keyboard is stuck<\/td>\n<\/tr>\n<tr class=\"row-7 odd\">\n\t<td class=\"column-1\"><strong>3 long beeps<\/strong><\/td><td class=\"column-2\">Keyboard card error<\/td>\n<\/tr>\n<tr class=\"row-8 even\">\n\t<td class=\"column-1\"><strong>1 long beep followed by 1 short beep<\/strong><\/td><td class=\"column-2\">Motherboard error<\/td>\n<\/tr>\n<tr class=\"row-9 odd\">\n\t<td class=\"column-1\"><strong>1 long, 2 short beeps<\/strong><\/td><td class=\"column-2\">Display adaptor issue<\/td>\n<\/tr>\n<tr class=\"row-10 even\">\n\t<td class=\"column-1\"><strong>1 long, 3 short beeps<\/strong><\/td><td class=\"column-2\">Check video card<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<!-- #tablepress-180 from cache -->\n<h3><span class=\"ez-toc-section\" id=\"Hex_Error_Codes_via_a_POST_Card\"><\/span>Hex Error Codes via a POST Card<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Beep codes and visual POST codes that are shown on your monitor can help you diagnose system errors as they occur.<\/p>\n<p>They\u2019re not without limitations, though.<\/p>\n<p>POST cards are a lesser-known method of generating POST error codes and diagnosing system failures.<\/p>\n<p>From a diagnostic standpoint, they offer more advantages than both the beep codes <em>and<\/em> the error codes displayed on a PC monitor.<\/p>\n<p>POST diagnostic cards plug directly into a motherboard\u2019s ISA or PCI port and display error codes in a hexadecimal format when the motherboard is powered on. They allow you to quickly diagnose POST errors without having to connect a monitor, hard drive, or even a keyboard.<\/p>\n<div id=\"attachment_20011\" style=\"width: 1331px\" class=\"wp-caption alignnone\"><noscript><img aria-describedby=\"caption-attachment-20011\" decoding=\"async\" class=\"size-full wp-image-20011\" src=\"https:\/\/g100.us\/wp-content\/uploads\/media\/2022\/09\/4-Digit-LCD-Diagnostic-Post-Card.jpg\" alt=\"4 Digit LCD Diagnostic Post Card\" width=\"1331\" height=\"1050\" srcset=\"https:\/\/g100.us\/wp-content\/uploads\/media\/2022\/09\/4-Digit-LCD-Diagnostic-Post-Card.jpg 1331w, https:\/\/g100.us\/wp-content\/uploads\/media\/2022\/09\/4-Digit-LCD-Diagnostic-Post-Card-300x237.jpg 300w, https:\/\/g100.us\/wp-content\/uploads\/media\/2022\/09\/4-Digit-LCD-Diagnostic-Post-Card-1024x808.jpg 1024w, https:\/\/g100.us\/wp-content\/uploads\/media\/2022\/09\/4-Digit-LCD-Diagnostic-Post-Card-768x606.jpg 768w\" sizes=\"(max-width: 1331px) 100vw, 1331px\"><\/noscript><img aria-describedby=\"caption-attachment-20011\" decoding=\"async\" class=\"size-full wp-image-20011 lazyload\" src=\"data:image\/svg+xml,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20viewBox%3D%220%200%201331%201050%22%3E%3C%2Fsvg%3E\" alt=\"4 Digit LCD Diagnostic Post Card\" width=\"1331\" height=\"1050\" srcset=\"data:image\/svg+xml,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20viewBox%3D%220%200%201331%201050%22%3E%3C%2Fsvg%3E 1331w\" sizes=\"(max-width: 1331px) 100vw, 1331px\" data-srcset=\"https:\/\/g100.us\/wp-content\/uploads\/media\/2022\/09\/4-Digit-LCD-Diagnostic-Post-Card.jpg 1331w, https:\/\/g100.us\/wp-content\/uploads\/media\/2022\/09\/4-Digit-LCD-Diagnostic-Post-Card-300x237.jpg 300w, https:\/\/g100.us\/wp-content\/uploads\/media\/2022\/09\/4-Digit-LCD-Diagnostic-Post-Card-1024x808.jpg 1024w, https:\/\/g100.us\/wp-content\/uploads\/media\/2022\/09\/4-Digit-LCD-Diagnostic-Post-Card-768x606.jpg 768w\" data-src=\"https:\/\/g100.us\/wp-content\/uploads\/media\/2022\/09\/4-Digit-LCD-Diagnostic-Post-Card.jpg\"><p id=\"caption-attachment-20011\" class=\"wp-caption-text\">Source: <a href=\"https:\/\/www.walmart.com\/ip\/For-4Digit-PC-Computer-Diagnostic-Card-Motherboard-Mainboard-POST-Tester-PCI-ISA\/1316189861?wmlspartner=wlpa&amp;selectedSellerId=101183927\" target=\"_blank\" rel=\"noopener\">Walmart<\/a><\/p><\/div>\n<p>Moreover, many POST diagnostic cards come with various LEDs for diagnosing issues related to power supply voltages, offering a comprehensive troubleshooting environment.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Common_Ways_of_Resolving_Errors_Detected_During_POST\"><\/span>Common Ways of Resolving Errors Detected During POST<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><a href=\"https:\/\/www.youtube.com\/watch?v=YKhCQmKAmEM\" target=\"_blank\" rel=\"noopener\">Fixing POST errors<\/a> after they present themselves <em>can<\/em> be overwhelming.<\/p>\n<p><noscript><img decoding=\"async\" class=\"alignnone size-full wp-image-20012\" src=\"https:\/\/g100.us\/wp-content\/uploads\/media\/2022\/09\/Troubleshooting-common-POST-errors.jpg\" alt=\"Troubleshooting common POST errors\" width=\"2048\" height=\"1080\" srcset=\"https:\/\/g100.us\/wp-content\/uploads\/media\/2022\/09\/Troubleshooting-common-POST-errors.jpg 2048w, https:\/\/g100.us\/wp-content\/uploads\/media\/2022\/09\/Troubleshooting-common-POST-errors-300x158.jpg 300w, https:\/\/g100.us\/wp-content\/uploads\/media\/2022\/09\/Troubleshooting-common-POST-errors-1024x540.jpg 1024w, https:\/\/g100.us\/wp-content\/uploads\/media\/2022\/09\/Troubleshooting-common-POST-errors-768x405.jpg 768w, https:\/\/g100.us\/wp-content\/uploads\/media\/2022\/09\/Troubleshooting-common-POST-errors-1536x810.jpg 1536w\" sizes=\"(max-width: 2048px) 100vw, 2048px\"><\/noscript><img decoding=\"async\" class=\"alignnone size-full wp-image-20012 lazyload\" src=\"data:image\/svg+xml,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20viewBox%3D%220%200%202048%201080%22%3E%3C%2Fsvg%3E\" alt=\"Troubleshooting common POST errors\" width=\"2048\" height=\"1080\" srcset=\"data:image\/svg+xml,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20viewBox%3D%220%200%202048%201080%22%3E%3C%2Fsvg%3E 2048w\" sizes=\"(max-width: 2048px) 100vw, 2048px\" data-srcset=\"https:\/\/g100.us\/wp-content\/uploads\/media\/2022\/09\/Troubleshooting-common-POST-errors.jpg 2048w, https:\/\/g100.us\/wp-content\/uploads\/media\/2022\/09\/Troubleshooting-common-POST-errors-300x158.jpg 300w, https:\/\/g100.us\/wp-content\/uploads\/media\/2022\/09\/Troubleshooting-common-POST-errors-1024x540.jpg 1024w, https:\/\/g100.us\/wp-content\/uploads\/media\/2022\/09\/Troubleshooting-common-POST-errors-768x405.jpg 768w, https:\/\/g100.us\/wp-content\/uploads\/media\/2022\/09\/Troubleshooting-common-POST-errors-1536x810.jpg 1536w\" data-src=\"https:\/\/g100.us\/wp-content\/uploads\/media\/2022\/09\/Troubleshooting-common-POST-errors.jpg\"><\/p>\n<p>So, if you suspect POST problems after your PC powers up, there are some basic steps you can take before trying to implement a fix.<\/p>\n<p>These include:<\/p>\n<ol>\n<li>Always check the power cable, making sure it\u2019s plugged in properly<\/li>\n<li>Disconnect any USB devices and external hard drives<\/li>\n<li>If you added any new hardware since the last time your PC was operational, remove it and check if the problem still persists<\/li>\n<li>Check if the system fan is running<\/li>\n<li>Check if the VGA cable is properly connected<\/li>\n<\/ol>\n<p>If you\u2019ve followed these steps and you\u2019re still having POST-related problems during startup, proceed with the following:<\/p>\n<ul>\n<li>Unplug your PC from the power source and allow at least a minute for the power to drain<\/li>\n<li>Open the system unit and reseat the CMOS battery, memory module(s), any device cards mounted on the motherboard, and all power and data cables<\/li>\n<li>Unplug and reconnect all connected hardware devices and peripherals, including your keyboard, mouse, external speakers, and monitor(s)<\/li>\n<li>Identify the beep codes or error messages on display and then use your manufacturer\u2019s manual to pinpoint exact problems and possible solutions<\/li>\n<li>If all else fails, talk to a PC specialist<\/li>\n<\/ul>\n<p>Unfortunately, not all errors can be detected via beep codes and error messages. Some require simple hacks and basic vigilance.<\/p>\n<p>For example, if the system has a speaker-related issue, you won\u2019t get the typical beep sounds that accompany POST.<\/p>\n<p>If you have a broken monitor cable or faulty video card, your display will be blank even if your PC runs through POST successfully.<\/p>\n<p>So, always make sure you\u2019ve covered the basics before going deeper into the diagnostic process.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Conclusion\"><\/span>Conclusion<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>POST is a crucial process that ensures your PC\u2019s hardware is operational and any related configuration data is accurate.<\/p>\n<p>And while most of the processes involved are technical, there <em>are<\/em> many POST errors you can fix even if you\u2019re not an IT specialist.<\/p>\n<p>If in doubt, refer to the instruction manual that came with your motherboard.<\/p>\n<p>If you don\u2019t have it nearby, head over to its manufacturer\u2019s website and download the whole thing in PDF format.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"FAQ\"><\/span>FAQ<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Let\u2019s go over a few potential questions you might have regarding this whole process:<\/p>\n<h3><span class=\"ez-toc-section\" id=\"What_Are_the_Requirements_for_a_PC_to_POST\"><\/span>What Are the Requirements for a PC to POST?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>PCs don\u2019t require much in the way of hardware to POST.<\/p>\n<p>At the very least, the PC needs a functional CPU, a stick of RAM, and the power supply unit (PSU) to POST.<\/p>\n<p>You\u2019ll of course need a graphics card and a hard drive with an OS to boot, but it\u2019ll POST successfully even without a keyboard, mouse, or a hard disk.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"What_is_the_Difference_Between_POST_and_BIOS\"><\/span>What is the Difference Between POST and BIOS?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>BIOS, short for Basic Input\/Output System, is the firmware that comes with every motherboard. It is the first application that runs on your PC when the power button is pressed.<\/p>\n<p>POST is a subroutine within the BIOS firmware and is usually the first instruction that is initiated by the BIOS to test your PC\u2019s core hardware.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"What_Happens_When_My_PC_Wont_POST\"><\/span>What Happens When My PC Won\u2019t POST?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Your PC may fail to POST for a number of different hardware-related reasons.<\/p>\n<p>Once your computer starts up, it\u2019ll POST to check if everything has been configured properly. If it encounters any issue, your PC\u2019s booting sequence will be terminated.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Over_to_You\"><\/span><strong>Over to You<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><em><strong>What is the oddest POST error you\u2019ve encountered on your PC? How did you handle it? Let us know in the <a href=\"#comments\">comments<\/a> section below, and in case you need any help, head over to <a href=\"https:\/\/g100.us\/forum\/\">our forum<\/a> and ask away!<\/strong><\/em><\/p>\n","protected":false},"excerpt":{"rendered":"<p>POST, short for power-on self-test, is a series of tests and procedures your PC runs through before loading the operating system. These tests help verify the health of your PC\u2019s components before the rest of the booting process can continue. Down below, we\u2019ll take a deeper dive into what POSTing looks like, what it means...<\/p>\n","protected":false},"author":2343,"featured_media":20004,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[303],"tags":[119,122],"acf":[],"_links":{"self":[{"href":"https:\/\/g100.us\/wp-json\/wp\/v2\/posts\/20002"}],"collection":[{"href":"https:\/\/g100.us\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/g100.us\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/g100.us\/wp-json\/wp\/v2\/users\/2343"}],"replies":[{"embeddable":true,"href":"https:\/\/g100.us\/wp-json\/wp\/v2\/comments?post=20002"}],"version-history":[{"count":10,"href":"https:\/\/g100.us\/wp-json\/wp\/v2\/posts\/20002\/revisions"}],"predecessor-version":[{"id":20852,"href":"https:\/\/g100.us\/wp-json\/wp\/v2\/posts\/20002\/revisions\/20852"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/g100.us\/wp-json\/wp\/v2\/media\/20004"}],"wp:attachment":[{"href":"https:\/\/g100.us\/wp-json\/wp\/v2\/media?parent=20002"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/g100.us\/wp-json\/wp\/v2\/categories?post=20002"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/g100.us\/wp-json\/wp\/v2\/tags?post=20002"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}