I recently upgraded from Windows 8 to 8.1 and received a warning that SecureBoot was not properly configured. I proceeded to try correcting this by installing the default keys from the BIOS and enabling SecureBoot.
After saving these settings and restarting, my system took significantly longer than normal (5 minutes) to boot, though Windows no longer showed the watermark/warning about SecureBoot.
After another restart, my system no longer boots into the OS, nor does it show any video on screen during POST or startup. I can tell that it is not making it to the point of loading the OS, as it shuts off instantly if I press the power button (which only happens when it is still in the boot process before things have been handed off to the OS). I have tried leaving it for many hours, and on each reboot attempt it seems to just stall somewhere in the boot process.
I tried removing the CMOS battery and draining flea power in an attempt to restore factory default settings on the motherboard, but this didn't seem to be effective (unless I needed to leave the battery out longer than a minute).
How can I disable this SecureBoot setting if I'm unable to get into the system's BIOS settings?
Using a Gigabyte GA-Z68MA-D2H-B3 with latest UEFI BIOS release, can update with additional components as needed.