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Dec 12, 2013 11:14 AM in response to Lando123by BDAqua,Hello,
Have you blown the dust out lately, especially the Graphics card & PSU?
Get Temperature Monitor to see if it's heat related...
http://www.macupdate.com/info.php/id/12381/temperature-monitor
If you have any temps in the 70°C/160°F range, that's likely it.