PC startup & BIOS errors
Identify where startup stops.
Does the computer show a manufacturer logo, a POST code, or a Windows error? Photograph the exact message and note any beeps. These are different stages of startup and need different troubleshooting paths.
Find your exact error
All BIOS & startup errors →POST-FAILURE
Power-On Self Test failed. The PC will not pass the check and will not boot.
BIOS & startupCMOS-CHECKSUM-ERROR
BIOS detected invalid data in CMOS. Settings have been lost.
BIOS & startupSECURE-BOOT-VIOLATION
Secure Boot blocked unsigned boot code from running. This usually traces back to old bootloader and corrupted EFI.
BIOS & startupBIOS-UPDATE-FAIL
Firmware update failed. The board does not need to boot.
BIOS & startupTPM-NOT-FOUND
Windows 11 or BitLocker does not find the TPM 2.0 module. The usual suspects are TPM disabled in BIOS, missing physical TPM and old firmware.
BIOS & startupBIOS-UEFI-BOOT-ORDER
The computer is booting from the wrong device (USB instead of SSD or vice versa) due to the wrong sequence in the BIOS. It's most often caused by attached USB with bootable media and more OS installations.