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Helpful answers
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Apr 4, 2014 7:38 AM in response to congabobbyby norm123,Hello congabobby
Try using a different cable or different video adapter if you are using one. Also check out the article below to further troubleshooting the issue further.
Apple computers: Troubleshooting issues with video on internal or external displays
http://support.apple.com/kb/ht1573
Regards,
-Norm G.
