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Helpful answers
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Sep 2, 2016 6:58 AM in response to GregC29by OGELTHORPE,I suggest a NVRAM reset:
https://support.apple.com/en-us/HT204063
If no success, make an appointment at an Apple store genius bar for a FREE evaluation.
Ciao.
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Sep 2, 2016 7:27 AM in response to OGELTHORPEby GregC29,Thanks. Didn't resolve the issue. Appointment made with Genius Bar.
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Sep 5, 2016 7:26 PM in response to GregC29by GregC29,After a diagnostics test at the Genius Bar, it was determined it was a bad video card.