I had been troubleshooting a bad HD, that was setup with Dual(Tripple) boot (GRUB2) for Fedora, Windows 10, and Ubuntu.
Windows 10 froze one day while installing a VM in Oracle's VirtualBox, and upon reboot, the default (Fedora) went to the grub menu. I rebooted, and used the ESC key (Asus boot key) to get to Windows 10, and kept working, and it eventually Hibernated (which I think may have contributed to the problems.)
I booted into Linux USB, tried a grub repair, but god indication there was a bad HD, verified that there were bad sectors, and my HD needs replacing. However, after that I mistakenly(i don't really know why I did, it was late, and not thinking properly) turned on the Fast Boot in the bios, which I think has allowed windows 10, even in it's partially booting state, to not allow me into the UEFI bios, so I can't even choose my recovery disk. It just boots up, no screen indicators at all, like there is no power going to screen.
Question 1) Is that possible? I assume if not, then I'm dealing with something worse than just a bad HD.
Question 2) Assuming that is possible, how can a UEFI/BIOS be freed from this Windows 10 control?