Help with iMac Dual Monitor

in Genius Bar edited January 2014
I'm trying to create my "evil genius" dual monitor set-up and I'm having a problem.

I've got a brand new 21" iMac, the Apple Miniport-DVI adapter, and a three yr old LG Flatron LCD monitor. The problem is that the second monitor doesn't seem to respond, or display an image. The Mac is definitely recognizing the monitor (ie. it shows up in the displays preferences) but so far, no worked. I've tried putting the Mac to sleep and waking, and even a full-restart with the second monitor attached, all to no avail.

Any suggestions would be greatly appreciated.

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