I had built a unit, for my side business simular to the gaming unit I upgraded. I'm not sure what's physically wrong if its a setting in the bios or a hardware issue. So I managed to get the necessary files off an reattached the drive an tried reinstalling the is using a sub with windows 8.1 pro an rufus. I have it set to run the install an such but, i get that its not able an asks for a source that it can install from. I tried changing cms to both setting an still the same.
Its an Asus board from what I can recall