I built an Amd64 box about 2 months ago. Today I wake up and it is shutdown. I turn it on and after a while it simply shuts off again. There are no warning beeps or anything. The CPU temp seems to stay at around 30 degrees C ... So i started to unplug things (harddrive, burner, extra fans ..etc..) and it is still shutting down. my question is.. could it be the power supply? I figured if the supply was bad the machine would just never turn on..but I cant think of it being anything else.. suggestions?