I've been at this one for months now. My wife's PC (an old eMachines w2040) started acting up one day all of the sudden. It started telling me it wasn't recognizing drives and such. Then it would just restart on it's own. If I tried to shut it down it would just start back up again. I replaced the power supply(480 w) and all ran well for about 6 weeks. Then one night I walk into the room and it's turned off. This is odd since it's normally on all of the time. I try the power button and I get nothing. No light, no fan, zero activity. So I figure the mobo went bad. Replaced it with a brand new one (a foxconn micro ATX AMD). Yes I know it IS a foxconn but it is brand new and it did get good ratings on newegg so I thought what the heck. But that didn't take care of it. Next I replaced the CPU with a new AMD duron. Still nothing. I've double and triple checked everything for compatability and even replaced the RAM for good measure. I've always been told that only 3 things can stop a PC from doing anything at all. The CPU, mobo, or power supply. But I've changed out all of them. What's next. Like I said the new PS got things going fine for 6 weeks before the PC died again. Could the new one have gone bad as well? I'm at a complete loss hear and would very much appreciate any help as the wife is getting pretty frustrated over it and I don't want that. lol.