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Old Feb 18, 2013, 10:29 AM   #1
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Join Date: Aug 2012
Plugging in an external monitor and it doesn't work

I have a Macbook Pro (retina) and, using a HDMI cable, I plugged it into a Dell U2711. Mountain Lion suddenly changes the screen display on the Macbook, but nothing happens on the Dell. It's just a black screen that says nothing is connected to it.

But clearly the Macbook sees it. When I unplug it, the screen display reverts to the original version.

What am I doing wrong?
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