BIOS & startup · critical

How to fixPOST-FAILURE

POST failure

What this error means

POST failure ranks as a critical-severity hardware BIOS/UEFI issue in our database. Power-On Self Test failed. The PC will not pass the check and will not boot. This usually traces back to defective RAM, defective CPU, disconnected GPU and faulty PSU. Work through the steps below in order.

Before you begin

Save open work and back up important files. Note any recent driver or hardware changes. If Windows cannot start, use the startup guide first.

Work through these checks

0 of 4 complete
01Remove unnecessary components

Remove unnecessary components.

Use the instructions for your exact device and operating system. Check the manufacturer’s documentation before changing firmware, hardware, or system settings.

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02Reset CMOS

Reset CMOS.

Use the instructions for your exact device and operating system. Check the manufacturer’s documentation before changing firmware, hardware, or system settings.

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03Check the connection

Check the connection.

Use the instructions for your exact device and operating system. Check the manufacturer’s documentation before changing firmware, hardware, or system settings.

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04Test POST speaker codes

Test POST speaker codes.

Use the instructions for your exact device and operating system. Check the manufacturer’s documentation before changing firmware, hardware, or system settings.

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Possible causes

  • Defective RAM
  • Defective CPU
  • Disconnected GPU
  • Faulty PSU