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My screen blacks out and mac goes to sleep.

124 Views 1 Reply Latest reply: Nov 14, 2012 7:45 AM by Linc Davis RSS
djonez Calculating status...
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Nov 14, 2012 3:09 AM

My screen blacks out and mac seems to go to sleep. Starts up again after 30 seconds.  This occurs after installing mountain lion.

MacBook Air, OS X Mountain Lion (10.8.2)

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