Firmware · critical

How to fixBIOS-BOOT-LOOP

Loop of reboots after BIOS

What this error means

BIOS-BOOT-LOOP is a critical-severity firmware problem. The PC restarts in an endless loop after POST. Problem with UEFI boot records or corrupted BCD. The usual suspects are damaged BCD and bad EFI entry. The steps below are ordered to resolve this efficiently.

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 3 complete
01bootrec /rebuildbcd from USB

bootrec /rebuildbcd from USB.

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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02Startup Repair in Windows Recovery

Startup Repair in Windows Recovery.

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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03Rearrange the boot order in the BIOS

Rearrange the boot order in the BIOS.

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

  • Damaged BCD
  • Bad EFI entry
  • Bad boot disk in BIOS