Hi guys. I'm pretty much at my wits end. I got this refurbished Gateway computer a few months ago, and right away it had issues. For one thing, it would not turn on AT ALL..and I couldn't figure out why. Until I reinstalled the RAM. Then things were fine until recently.

Question/Problem:
The first few months were great..like any PC/human relationship, but then things went south. Now it shuts itself off automatically without warning. And I don't mean shutting down or giving me the BSOD. I could be doing anything really. It mostly happens when I'm surfing the web on Firefox. But when it's idle it doesn't shut off much.

Operating System, Version and Service Pack:
Windows XP Professional Service pack 2.
Intel
Pentium 4 CPU 2.80GHz
2.79 GHz, 1.98 GB RAM

Web Browser and Version:
Firefox 18..although I don't think this matters

Your level of experience:
between seasoned and expert

When did the problem start? Has it been going on constantly since then?
A few months ago. It's getting more frequent. At least 5 times per day. My computer can't be on for more than 3 hours until it shuts off..unless it's idle

Any steps you've taken to troubleshoot?
Yes, lots. virus scanning..turned up nothing. "last known good configuration"..nada. system restore..didn't do squat. reinstalled the RAM..nothing. letting it cool down..nope! updated the display driver..negative. i'm not sure what else i can do. i don't think reinstalling windows would do it.

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please...i beg of you..HELP!! :(