HT201177: Get help with video issues on external displays connected to your Mac
Learn about Get help with video issues on external displays connected to your Mac
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Aug 2, 2016 6:54 AM in response to tlc277by rkaufmann87,★HelpfulEither the GPU or display itself is failing. Take the computer to an AASP in your area to be professionally diagnosed, then you can decide what to do. If you don't know any AASPs in your area, please click the following link to begin finding one.
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Aug 2, 2016 6:58 AM in response to rkaufmann87by tlc277,Thanks I am taking it in today to the Apple Store.