Not Detecting Dual Monitor

I've got a 4870 card and connected the DVI port to a 27 inch Samsung and the mini-display port via the $99 mini-display to dual link DVI adaptor to a 23 inch Samsung. This set-up worked fine with 2 of the 23 inch Samsung, but now it is only detecting the monitor connected to the DVI port. It is not detecting the monitor through the dual ink adaptor.
I swapped around to eliminate other variables, and also tried unplugging from the DVI port and running the mini-display to dual link alone: nothing.
The mini-display adapter is working fine with my wife's macbook pro. As mentioned, this set-up works fine with two 23 inch monitors. Any thoughts of what I might try?

In searching, saw what Martin Pace wrote in another post on this: first, make sure the mini-display port is fully plugged in! There's a fair degree of resistance over a distance, so it's easy to think it's in and be afraid of forcing it. Of course, plugging in makes it work instantly.
So Martin, if you reply, I'll give you a solved!

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