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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Oct 21, 2015 10:37 AM in response to Lynn46by Johnb-one,★HelpfulI'm afraid you're going to have to take it to be repaired. A Genius Bar appointment is free, though
JB
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Oct 21, 2015 10:00 AM in response to Lynn46by lllaass,For the future note that you posted in the Mac Pro desktop forum