BIOS / UEFI Error Codes

The system failed to read from the boot disk during early boot.

Firmware could not boot from the current device and is prompting for bootable media.

The system cannot find the Windows Boot Manager on the selected boot device.

The selected disk does not contain a valid boot record for the current boot mode.

The system found an invalid or non-bootable partition table on the selected drive.

The system is attempting a legacy boot but cannot find the required loader on the boot device.

Firmware could not find a bootable operating system on the selected device.

The system detected bootable external media and is asking whether to boot from it.

The system attempted to boot from the network (PXE) and failed, often after it couldn’t boot from local storage.

Firmware cannot find a bootable device from the current boot order selection.

Firmware could not locate the configured boot device or boot partition.

Firmware reported that the battery maintaining time/settings is not functioning correctly.

Firmware reported that stored configuration data failed validation.

Firmware detected a problem with CPU cooling fan operation.

Firmware reported that a required keyboard input device was not detected during POST.

Firmware could not find a valid bootable device for the configured boot order.

The system attempted network boot because a local boot device was not found.

Firmware blocked boot because Secure Boot validation failed.