My Mac Pro (2006) with NVidia GeForce 8800 GT is not detecting a second display. What can I do?

My Mac Pro w/ NVIDIA GeForce 8800 GT does not detect a second display from the System Preferences / Displays. Even though I select the "Detect Displays" button, nothing happens. I also have Bootcamp and Windows 7 in a partition on my drive. When I operate with Windows 7, there is no problem detecting both of my displays. However, when I operate with Windows 7, there is no sound signal sent from my sound card. When I switch back to the OS X then I get a sound feed from the sound card, but then it will not detect more than one monitor. I'm ready to pull out my hair. Anyone have suggestions?

http://store.apple.com/us/product/MC094Z/A
Leopard 10.5.6 DVD (Amazon has it for $106)

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It's a little late for me to jump into your discussion, I only read it when I posted an issue with the same model.
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Hello there,
I have a 3,1 mac Pro with the bto Nvidia 8800 GT in it, but buying the Apple/ATI 5770/5870 as 'upgrade' is somewhat expensive (where do these prices come from??), I was wondering whether I could 'just' buy a normal 5870 (for less than the half of the apple one) and add it to the system to be used under Windows only (and hook it up with a second cable to my monitor) - so I keep the 8800 for EFI boot/mac os x, but would use the 5870 under windows.
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Hello there,
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Here's another similar experience -- and my solution.
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It's a little late for me to jump into your discussion, I only read it when I posted an issue with the same model.
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_*Hi to All:_*
_First of all thanks for taking the time to read my post._
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Message was edited by: Chocorito

Applemecanix are the Microsoft of card flashers.
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(Everything bought from the Mac Store)
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Search long enough and you may find...
According to this
http://www.playtool.com/pages/psuconnectors/connectors.html#pciexpress
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Hmmm

My Mac Pro (2006) with NVidia GeForce 8800 GT is not detecting a second display. What can I do?

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