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Computer continuously shuts down and reboots on its own

Last response: in Windows XP
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February 4, 2014 12:20:46 PM

I've had this computer for a while, and a few months back, it started messing up. I figured it was just the cord, so I waited until I got a new one. I got the new cord yesterday and the computer worked fine. I was on it for about 3 hours with no problems whatsoever. Then I get on today and after about 40 minutes it goes through the shutdown process. then it turns itself back on. It stays on for a minute but the monitor never comes on (it is properly attached) and then it shuts back off. this happens until I unplug it or flip the lightswitch (it is plugged into an outlet that is connected to a light switch).

Does anyone know what might be causing this?
February 4, 2014 12:45:52 PM

Sounds like it is overheating but not sure. What do you mean by flip the lightswitch ? If you can get it running for a bit check hardware monitor for temps. Or download a temp monitoring program. Start there.
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February 4, 2014 5:25:09 PM

If it is overheating, how do I know what fan to get? Intel Core2 Duo E8400
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February 5, 2014 9:06:54 AM

Google it , I don't mean to sound like a broken record. But look for a fan for what socket that processor is. Easy Peezy. :) 
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Best solution

February 5, 2014 4:18:28 PM

If it stays on for a minute, you have time enough to check the BIOS temperature reading. The key to enter the BIOS is usually the DELETE key or F2.. press it repeatedly right after pressing the power switch.

If temp seems normal, wait for a while to check if it goes up. If it goes above normal, open the case and check the processor cooler, check that the fan turns normally and that the heatsink isn't lose on the processor. If all seems normal, you may have to refresh the thermal grease between the heatsink and processor, also check that the power supply fan is running normally.

If temp remains normal when it shutsdown, look for deffective hardware removing everything except for the keyboard and mouse. Also check the power and digital connections on the motherboard.
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