Hi,
Have replaced EVGA 670 with ASUS 670 and bios is now visible (PS. PC was still able to boot into windows, bios/ POST had no display with "Error 51")
However, I have picked up another problem with the DX79TO series.
Unable to set memory to 1600, memory only works under clocked at 1066.
Configuration:
Intel DX79TO or DX79SI mainboard
Intel i7 3820, 3.6Ghz
Corsair Dominator 2 X 4GB DDR-1600 (CMP8GX3M2A1600C9)
ASUS GTX 670 2GB
Cooler master 1000W PSU
Kind Regards
Lyle Stanford
Sastec Technical Division