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Old 11-11-2010, 12:08 PM   #2
Carlo
Mac Team
 
Join Date: Feb 2009
Posts: 606
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Most likely it's the known i5/i7 issue already reported multiple times on the forums. Try to turn off Automatic graphics switching in the Energy Saver preferences.
Or, better, try to upgrade to 10.6.5 as it might have fixed this issue.
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