I have installed LMDE today on a old pc (AMD socket A MBO) and when i try to boot it i get "disk boot failiure, insert system disk and pres enter".
I have tried to install grub on the same partition as boot and on a separate one, same problem.
Tried to restore bios safe defaults, same problem.
Tried to reinstall LMDE, same problem.
Im not using any raid, single HDD in the pc.