PC fails to start in BIOS or doesn’t boot after turning on Secure Boot.
PC fails to start in BIOS or doesn’t boot after turning on Secure Boot.
Disconnect the drives, try accessing BIOS again. Your partitions might be set up as MBR. If you can reach BIOS, revert the changes. Once back in Windows, use utilities to change MBR to GPT. Secure Boot needs UEFI mode enabled. https://docs.microsoft.com/en-us/windows...mbr-to-gpt
Attempt to connect the GPU, insert HDMI into Mobo even without an APU. Let it idle with a black screen; this might reset the secure boot key or hardware recognition. I’ve heard it helps in some cases. Once it’s running, reinsert the GPU and see if the signal appears.