You need to do this:
After I got to the BIOS it was as simple as changing the 'boot' option from "EFI boot" to "disabled"
Anyways that's how I solved this strange problem, I hope I could help out others! (:
other option is reset bios to defaults.
EFI shell is part of the BIOS, so its a motherboard based problem.
what hdd do you have as you might want to test it out as well. Its unusual for the Efi to lose the drive mapping.