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Summary :

computer won't post

Sometimes when you turn on your computer, you may find it won’t post before going to BIOS. As a result, the computer fails to start up. If you are experiencing this case, refer to this post and MiniTool will offer some methods to get rid of computer not posting.

Computer Won’t Post

You should know that the computer will start power-on self-test (POST) when the power is turned on. This can ensure the computer’s hardware works properly before loading the operating system. If the hardware passes POST, the startup process will continue and a single beep sound appears. If the computer doesn’t post, the PC cannot go to the BIOS menu and it is not bootable.

To learn more information on power-on self-test, refer to MiniTool’s library - Full Introduction to POST and It’s Different Types of Errors.

Why is the computer not posting? A POST failure can be triggered by some reasons, for example, new hardware conflicting with old hardware, failing or bad hardware device, electrical shorts or incompatibilities.

If you are encountering this issue, what should you do to get rid of PC not posting? Try these methods to easily fix this problem. Let’s see them now.

Fix It If Computer Won’t Post

Remove New Hardware

If you have recently added new hardware to your PC, just remove it to ensure it is not the reason for PC not posting. After removing the hardware, if the PC works well, it is possible that the new hardware is not compatible with your PC, or you need to change a system setting to work with the new hardware device or the new hardware is defective.

Remove USB Devices &Disc

If you connected CDs, DVDs or USB devices including iPods, phones, drives, etc. to your computer, disconnect all of them and reboot the computer to see if it can pass POST.

Disconnect External Devices

Except for the power cable, remove everything from the computer’s back. Then, power on the PC to see if its beep sound is normal. If there is not a beep sound, connect the monitor or display and see if any change happens.

Identify Beep Codes

If you get a series of beeps, check the motherboard or computer documentation for the information on beep codes or go to this post from computerhope - Computer POST and beep codes to know much. Then, you can identify which component of the computer goes bad or failing.

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If you cannot diagnose the problem via the beep code or there is no beep sound, turn off your computer. Then, disable the IDE, SCSI, SATA or other cables from the motherboard and reboot the computer. If this works to fix the POST failure, reconnect each device at a time to ensure which device is causing the issue

Check the Power Cables

Make sure the power cables are connected properly and securely.

Besides, if the computer doesn’t have enough power or the power is interrupted, there may be some problems, for example, the computer won’t post. Just disconnect power cables from any power strip and connect the computer to a wall outlet.

Check All Fans

You can check your computer’s fans and see if they are running properly. If a fan, especially the CPU’s heat sink fan fails, the computer may be overheating or detect the fan failure, leading to a POST failure.

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Disconnect All Expansion Cards

Sometimes disconnecting the riser board and all the expansion cards is helpful if PC won’t post. These cards are not essential to system operation. If you find this way can fix the issue, connect one card at a time until you know which card causes the problem.

expansion cards

Disconnect and Connect RAM and CPU

If the computer still won’t post, try to disconnect the CPU and RAM from the motherboard. Then, connect them back to see if your issue is solved.

Other ways:

  1. Ensure RAM is compatible with the motherboard.
  2. RAM, PSU or motherboard may be damaged and you need to test each component separately. If one of them is bad, replace it.

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Final Words

Computer won’t post? After reading this post, you know what you should do to troubleshoot PC not posting. Just follow these instructions and know what causes the issue and fix it.

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