Okay now this is weird. I set my power to high performance. Then I loaded up furmark. Instead of a black screen I get a screen that looks like cardboard (light/dark brown stripes). Had to restart. Then I loaded up Crysis to see what would happen. A small black window popped up, then these flickering blue and yellow pixels were on my screen for a while, then my screen turned gray. I had to restart again.
So no black screen, but still the system locks up.