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

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

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

Posted on Jun 30, 2013 2:32 PM

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Answer 1

BDAqua

Level 10

239,225 points

Jun 30, 2013 7:05 PM in response to Naughtypony

Hi, a few have had succsess with a different connection typ, even fewer have had a bad cable out of the box.

What inputs does it have?

Are ther any input settings on the monitor for Source or such?

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Answer 2

Naughtypony Author

Level 1

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Jul 1, 2013 11:43 AM in response to Naughtypony

It has a VGA and DVI HD port. It is an Acer X203H bd. 09' model. Do I need a converter from Apple? I cannot currently see the settings since I cannot run through this I Mac. My Mac Book Pro could run it, but I don't have a cable. The new I Mac picked it up right away. We synced and color balanced just fine during set up phase. It worked for a day or so. Then I shut down for the night. Next morning the blinking began.

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