I'm having some of these same issues..not with the same mobo or proc tho. But from what i've read. This can be anything....RAM,MOBO,Graphics card and or PSU. So what im doing when i get home tonight is. Pull out my video card first...and rehook a monitor to the onboard video. to make sure my psu isnt underpowered and its shutting down because of that. Next ima take each stick out on at a time. And if that doesnt work then we're looking at most likely a mobo problem. From what ive read the.... Memory Management Unit can go bad..causing this problem.
Did you ever figure out what the problem was?