Why do my screens occasionally go off then back on?

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Oct 14, 2007
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Occasionally, when I'm connected to my external monitor and doing dual screen, both screens go off and back on. It takes a second. Everything resumes as normal. But it's disconcerting. I havent been keeping a log, but it doesnt seem to happen with any regularity. Just at random times.

Any thoughts?
 
Joined
Oct 7, 2010
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Your Mac's Specs
15" MB Pro, 2.66 i7 ; 11” MBA 1.8GZ i7; 13"MBA 2GZ i7 8 GB mem 512GB SSD, 2 iPad3s, 1 iPad Mini
I have the same

Is that not normal?
 

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