Another faulty
mobo would be kindof a bugger but it looks more like the
ram than anything right now I think and your
ram and
CPU seem to be the only things you haven't swapped out yet, I'd try the
ram first as it's generally most likely to ship faulty.
What's the wattage on your power supply, I'd imagine you wouldn't want to be running such a beast of a machine with anything less than a 420 Watt and that might be cutting it close.