Stops at 7F during boot

This is a new board that Stops at 7F during boot. I have tryed all the usual . . . changed P/S, video cards, ram, keyboards each several diff ones. I have it sitting on my workbench with only cpu/hs-ram-video card-power supply no HD, floppy or anything else. I have reset cmos 4x and double checked jumpers. The pc diag card is persistant reporting 7F after every change, then the boot process stops again at 7F.Does this sound like some thing any one else has gone through?