My motherboard died for an AMD Phenom processor, so I ordered a cheap replacement on ebay. It works, but it's old.
I connected my hard drive (it shows a /boot/efi partition in /etc/fstab) to the new motherboard and the bios didn't see the boot. I connected an old hard drive (it does not show a /boot/efi partition in /etc/fstab) to the motherboard, and the bios did see that boot.
There is no option for UEFI in the bios. It's an MSI board with something called 2.2 Tb Infinity on the boot menu, which supposedly is something like UEFI (according to Google), but then again, it's not.
I can now boot both hard drives, because I updated grub from the old hard drive and it found my EFI boot (not sure how that works). But it's a Frankenstein system, and the old hard drive is showing signs of failure.
Is there any way for me to switch my EFI boot to a legacy boot so I don't have to go through another disk to boot? I have all my data saved and could reinstall, but there's a lot of configuration of my system that I don't want to lose or have to redo.
I apologize if I've misdescribed the problem. I'm not a newbie, but I'm not a programmer either. Some things are just a black box to me. Thanks beforehand.