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Original post by: Corey Wooden ,


I see it’s been a while since this question was asked, but I thought I’d add my testing / solution.

I have a spare 27” Apple Display that’s maybe 5-6 years old.  I had read something on another blog to test the built-in monitor by attaching an external monitor to see if the flickering continued.

When I attached the '''second monitor,''' it continued flickering.  I went in to play with the monitor setting and when I changed the settings to '''“Mirror Display,”''' the flickering went away.  As soon as I set the monitors to continuous, the flickering came back.  It’s 100% repeatable (every time I set the monitors to mirror, the flickering goes away.

I’m going to test it with a smaller monitor as soon as I get a Thunderbolt to DVI adapter.

Good luck and hope this works for you.