8 minutes ago, Radium_Angel said:
When I put in the new CPU, and powered back on, the mobo said "new CPU detected, resetting BIOS to default" which it was anyway (again, AFAIK) no OCing, no XMP, I think the only thing I had changed other than default, was turning off the TPM settings, since the board doesn't have a TPM unit anyway.
Nope and Nope.
Hence my surprise....
Try regenerating your grub configuration, maybe the BIOS reset randomly reassigned drive labels
grub-mkconfig -o /boot/grub/grub.cfg