DisplayPort not functional in 2008 MP with GT120 and GTX285

Hi all,
I've searched the forums, but with no luck.
I can't get any sort of signal out of the Mini-DisplayPort of my GT 120 in my 2008 Mac Pro.
I've tried the following:
Mini-DP to DVI adapter -> DVI -> Display
Mini-DP to DVI adapter -> DVI to VGA adapter -> VGA -> Display
Mini-DP to VGA adapter -> VGA -> Display
Mini-DP to VGA adapter -> VGA to DVI adapter -> DVI -> Display
I know some of those configurations are plain ridiculous - but what really is the ridiculous thing is that the DisplayPort just +doesn't work+.
Any ideas?
Could it be conflicting with the GTX 285?
I'm running all the latest updates and drivers for everything.
Many thanks,
Robert

The Dell and Sony Bravia work fine off the GTX 285, as well as the DVI port of the GT 120. It's purely the DisplayPort that refuses to play ball with anything.
Considering how DVI-D is just DVI-D, I don't know how there can be any discrepancies between manufactures to the end result of them just not working with each other. Madness.
I do have a Gefen DVI Switcher laying around, so I may as well use that off the DVI port of the GT 120, and switch between my third monitor (the Dell) and the Sony Bravia. I'd only use the Bravia when I'm not sitting at the Mac, so loosing a display temporarily isn't a problem.

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