Dual Display Problem - Mac Pro / 23" Apple Cinema

Hey guys, I'm having a bit of a hard time right now. Here's my situation. I'm using my Mac Pro with a primary HD Apple Cinema Display 23". I just recently stumbled upon a Sony HS95P. I've used this monitor before as a second display a few years back. I bought a " DVI 24+1 male to VGA female adapter DVI-D DVI-I DVI-A " and plugged it into my computer, no problem. Display shows up in system preferences, when I check mirror displays it takes the resolution of the 2nd display and the Sony flashes. However no screen, Blacked on the Sony. When I set up the displays to run into eachother, I can venture my mouse over onto where the other monitor would be, however it's black on the Sony.
What could be the problem? I didn't buy the Apple adapter, but could this REALLY be that serious of an issue? I didn't use it in the past, atleast I don't think I did.. Also could it be the OS? I'm using 10.6.8. Any help or advice/things to try would be awesome...  I have two DVI slots in the back of my Mac Pro, gfx card is a NVIDIA GeForce 7300 GT. Thanks guys.

I'm back. Got my Mac Pro back from repair today. Ahhh...25" screen. However, they (the Apple Repair People) have put a new GeForce 8800GT in, to replace the old one.
And the final bill was $380 CDN ($40 for work, the rest for the card, around $300.)
What's Apple's policy on graphics card replacement, even if the customer is paying for it? I thought I asked for a new ATI 5770 card, but maybe I was wrong. I don't think I can take her back in and ask 'em to put a better card in there, and only ask for a bit more to cover the difference in price. I've got a feeling it doesn't work like that.....
thanks
John B

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