Multiple GeForce GT 120 Graphics cards on Mac Pro

I have an Early 2009 Mac Pro 4,1 Quadcore 2.66GHz running OS 10.6.8, with the factory-supplied NVIDIA GeForce GT 120 Graphics card (in PCIe Slot 1), connected to a Lacie Photon19vision Monitor (via VGA thru MiniDisplayPort adaptor) and a 30" Apple Cinema Display (via Dual-link DVI) - this has been working perfectly for years.
I have just got a 2nd GeForce GT 120 from eBay to utilise a 2nd Lacie Photon19Vision Monitor as a 3rd display via this 2nd NVIDIA card, which I installed in PCIe Slot 2. Both this 2nd card and this 3rd display are recognised in System Profiler, but I am unable to get a visible signal through to the display. I have tried the following connections:
VGA (monitor) - VGA/MiniDisplayPort Adapter (card)
DVI (Monitor) - DVI (card
DVI (monitor) - DVI/MiniDisplayPort Adapter (card)
None of these have worked.
Any advice on using more than 1 GeForce GT 120 graphics card in the Mac Pro, and/or the best connection configuration?
Many thanks in advance!
Na1dacra

The hatter is right that at one point, multiple NVIDIA cards caused a problem. But that problem was Kernel Panics, not failure to operate.
You need to be certain the new card works by itself. To do that, install it in slot 1 as the only card, and be certain all the old functions work as you expect. Then you have known-good parts going forward into more complex testing.
When using multiple display, you must be certain you have completely eliminated Mirroring, which will limit resolutions to those that seem to be possible for both displays. You should have a separate blue box for each display, and none should overlap.

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Hi-
Welcome to Discussions!
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Nick Holmes wrote:
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Julien_deka wrote:
First think strange... I used to run my Wacom Cintiq from a second graphic card - NVIDIA GeForce GT 120 - through mini-dispaly port, and this stoped to work... I have to use another port (DVI) from this same card to have a display on my Cintiq.
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Hello all,
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Multiple GeForce GT 120 Graphics cards on Mac Pro

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