Well I really screwed up tonight. I was attempting to remove my old power supply and managed to strip out the back left screw. These guys were in real tight, none of them came out easily. Any suggestions to removed the stripped out screw or am I stuck using a dreamer to cut in a slot to fit a flat head. Update: I bought a screw extractor bit and managed to removed the stripped screw manually. The replacement power supply seems to be working fine. Thanks everyone.