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chscag

 
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Member Since: Jan 23, 2008
Location: Fort Worth, Texas
Posts: 40,097
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Random shutdowns are hard to track down. Usually, they're caused by a hardware fault which means it could be memory, overheating (fans not running), power supply problems, faulty logic board, and so on.

What if anything do your logs say?

Also, you might want to download a free application which can monitor the temperatures and fan speeds. iStatPro is a free (donation ware) Dashboard widget which gives a read out of fans speeds and temps.
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