20" acrylic Display not working with 15" MBP

I have a 20" acrylic Cinema display (with the Apple ADC-DVI adapter) that works fine with a PC and with my 15" G4 PowerBook. When I try to use my 15" MacBook Pro (the 512meg VRAM one) the internal screen flashes but the Cinema display never shows anything on the screen. It is detected and properly identified and I can set the res, etc. in the Display prefs. I can move the mouse off the internal screen over to the Cinema display as well, I just can't see it. When I switch on Display mirroring the internal monitor seems to display the screen from the Cinema display because the background changes to the default apple one.
The MPB works fine with an external Samsung 20" LCD. So I don't think it's the DVI port...
I'd hate to have to get a new monitor just because I can't get this one to work. Any suggestions?
Thanks. Ray

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Atiya wrote:
I have a Mac Pro (2 x 2.4 GHz Quad-Core, model identifier MacPro5,1) purchased in late 2010 and a 24" LED Cinema Display. The Mac Pro has three video ports--a full-sized DVI and two mini DVI. When I plug the Cinema Display into either of the mini DVI ports, I cannot get a picture, although the iSight camera works fine. If I plug another monitor into the full-sized DVI port the computer believes that is the only monitor. The Cinema Display works fine with my MacBook, so there is nothing physically wrong with it.
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