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Flickering problems with an external monitor hooked up to a 21.5 I Mac

184 Views 2 Replies Latest reply: Jul 1, 2013 11:43 AM by Naughtypony RSS
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Jun 30, 2013 2:32 PM

I have a two week old I Mac that I have hooked up to an external monitor VIA a thunderbolt cable into the DVI port on monitor. When the I Mac first was plugged into the Acer monitor, It recognized it, and it was formatted correctly. Now when I reboot, if the Acer is connected, my I Mac will not stop flickering from a blue screen to my desk top image. I have already had the I Mac looked at by certified Mac techs. They found no problem with the computer. The issue must be with the monitor. I need a second monitor for work, that is why I purchased a new Mac. Why am I having this issue? Do I need a different cord? Please help.

iMac, OS X Mountain Lion (10.8.4), Acer monitor / DVI

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