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Computer shuts down automatically

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My computer keeps shutting down and restarting about three times a day. No apparent reason. Once though, the screen froze while in screen saver.

This has just started. I don't download anything weird or out of the ordinary. Have AVG Free Edition antivirus installed.

Any thoughts

Windows XP HOme
2.8 GHz 80 Meg
.098 MB RAM
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Three main causes of restarting:

Overheated CPU

Faulty power supply


I noticed that it said you only have 98mb of RAM, this is an odd amount, and not enough to run an updated installation of XP. You can download memtest86 to a floppy or CD and run it to test your memory. Just run it for a couple of hours and look at the errors entry.

Make sure your CPU fan is running and the cooler is clean and not loose. Also the power supply fan. The best way to test the power supply is to substitute a known good one of the same type and as good or better rating.

A fourth common cause is faulty motherboard, especially the capacitors on the board. Several little cylinders near the CPU, make sure none are bulging or leaking.
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