Well I just upgraded to a ATI 9500 pro, I was playing Dungeon Seige and everything was fine. Just to let you know I have a 300 watt psu. Then I started to play the Unreal Tourney 2003 demo and about 10 minutes into it my computer shut down. I checked the cpu, it doesn't look fried. I want to check the power supply but I can't get ahold of at tester(CompUSA is out). But the salesman at CompUSA said there is a way to use a paperclip to short the power supply by attaching it to the ground and another plug. does anyone know how to do this?