bdary
It's unlikely you'd have that on two boards in a row. Have you tried clearing the cmos? Can you get into the bios at all? If so, hit F5 to load defaults and see how that works.
I tried clearing the CMOS and get an option of F1 Setup or F2 LOad Default and a B4 Post Code however, when I press a key that's it. It does nothing else and the Post Code changes to a B2. I tried my GPU on a 790i Ultra SLI Board and it worked perfectly. I can't even get to the BIOS so I'm not sure what the hell the problem is.