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Oct 21, 2015 2:11 PM in response to drock3800by joe_7399,Hello drock3800,
Thanks for using the Apple Support Communities!
I understand that you are having issues with video on your display, specifically with one Mac where your other Mac computer’s don’t have that issue. I see as well that you have already completed a lot of great troubleshooting but the issue continues.
To continue the troubleshooting process, I suggest reading over and working through the suggested steps located in the following article. A lot of the steps you may have already completed, but there are several such as resetting the system and resetting the resolution that you may not have completed yet.
Apple computers: Troubleshooting issues with video on internal or external displays - Apple Support
Have a great day!
