Pattern to record: The firmware rejects a previously bootable system after an update or board change.

Record the boot configuration

Use the motherboard model and revision, not just the PC case brand, to select firmware documentation. Record POST indicators and recently changed memory, graphics or storage before returning settings to a documented baseline. One possible explanation is that trusted keys and the installed loader no longer agree.

Preserve recovery options

Firmware updates require the exact motherboard model and stable power. Clearing keys without approval can break managed security and encryption.

Firmware and hardware checks

1. Reduce to known hardware, inspect POST indications and compare saved settings with board documentation.
2. Record key state and verify the operating-system loader and organisational policy.

Recovery and startup checks

If the checks support this cause, restore approved keys or repair the signed boot chain. Verification should cover cold start, restart, memory training, storage, expansion cards and saved settings.

For an assessment of your desktop computer, contact AEPC in Burswood or call 027 908 8880. Provide the model and the conditions that reproduce this problem. Workshop visits are by appointment.