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chscag

 
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Member Since: Jan 23, 2008
Location: Fort Worth, Texas
Posts: 38,392
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Mac Specs: 27" iMac i5, 3.2 GHz, iPad 3, iPhone 5c, 3 iPods, OS X Mavericks

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A bad video card can completely freeze the system and or produce symptoms varying from a dead keyboard and mouse to the fans running up at high speed.

The only other thing I can think of is a possible flaky power supply but that usually impacts the entire machine.
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