I am trying to install a second monitor on my Optiplex 9020 DT (I'm using Windows 7 Professional). Both are Dell U2412M Flat Panel Monitors. I have one plugged in using a DVI and one with a VGA, as there aren't two DVI ports. The one plugged in using the DVI is recognized and is just fine. The other I can't get the computer to recognize at all.
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