So glad I found this forum! My computer (intel 4.0 WinXP SP2 1 gig Ram) shuts down and mostly when it's just sitting idle. No errors/blue screens nothing. Just like the power went out. I thought 'heat related' but I have the side off and put a big fan there already. When this happens it would take 15 mins to 1/2 hr to get it back on (a real pain when I'm at work and need to get into something quick) but once day out of frustration I just started trying to reseat stuff like Ram, cards, plugs. Then I found that once it shut down, I just pulled out the power supply plug from the motherboard and plug it right back in (pull off then back in) it would boot right up (normally) like I just started it back up in the morning......no error messages, no phone-home questions, just like nothing ever happened? Any ideas?