I have a custom built Windows 10 PC using a Gigabyte AORUS GA-Z270X Gaming 7 1151 7th Gen DDR4 RGB Fusion motherboard.
Stupidly, I tried to change my BIOS settings to prepare for Windows 11 and I now regret it as my PC won't boot. Two issues were reported by the Windows 11 Update check, both of which required BIOS changes to fix;
TPM
Secure Boot
I managed to Enable TPM without issue, but in order to turn on Secure Boot, it was necessary for me to change the BIOS "Windows 8/10 Features" option from the original setting "Other OS", to "Windows 8/10" in order to then disable "CSM Support".
After saving these BIOS settings and rebooting I got the following message:
"Reboot and Select proper Boot device
or Insert Boot Media in selected Boot device and press a key"
I tried changing the settings back, so CSM Support was Enabled and Windows 8/10 Features was set to Other OS. Saved and restarted, but still get the message above.
It would appear that BIOS no longer recognises the M.2 drive in my desktop PC.
I have considered booting from a Windows 10 repair disc, but don't want to do this without being sure there isn't a better way to recover the PC. I would also like to understand what has happened as there are many websites/videos showing this method of setting Secure Boot with no mention of the potential disaster that may occur.
Any help would be much appreciated.