How can I get a VGA card to run anLCD

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 one 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?
Is ther an adapter?
Any advice?

Your control is allowing the app to run or not. I'm not sure what other type of control you could possibly mean since any app, once running, does whatever it does; you can't control any app past that point.
If you prefer not to disable the settings in the System Preferences, then right click on the app and choose Open. That will allow that app to run while still leaving the basic security feature on. You only need to do this once. The app will be assumed as trusted after that.

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