I have 2 LCDs, one will not come on

I have a mac 2.66 quad core intel xeon with three graphics ports.
I have been using an Apple 30" lcd which has worked fine.
I just acquired a smaller apple LCD and plugged it in one of the extra ports. When you push the on button (lower rt side) the light on the button lights up but does not stay on nor does the monitor ever light up.
Here is likely the problem but I don't know how to fix it.
One port is listed NIVIDA GeForce GT 120 Display Controller, this open works fine.
The one that doesn't work is listed simply"display" and under type it's VGA-Compatible Controller. This one doesn't work?
Any advice?

This is an iMac forum, why aren't you posting in the Mac Pro forums?

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