Original Nvidia Quadro Fx 5600 1.5gb Pcie Video Card For Mac

Original Nvidia Quadro Fx 5600 1.5gb Pcie Video Card For Mac

So, a friend of mine asked me to look at her friend's MacPro. It's a 2008 MacPro 3,1:
http://www.everymac.com/systems/apple/mac_pro/stats/mac-pro-eight-core-2.8-2008-specs.html
Anyway, according to the system owner, the problem started where he would be using the system (it's running Leopard, 10.5.8) and some flickering vertical lines would appear along with a message indicating he needed to press and hold the power button to restart his system, due to some kind of crash. He would do that and be able to boot the system and after a while, the vertical lines would appear along with the message about pressing and holding the power button to restart the system.
I took a look at it and wanted to make sure his 30' monitor was ok. So, we used his DVI to VGA converter and connected a 15' Dell LCD monitor I had to see if the system would boot, etc. When I first powered up the system, with the Dell monitor connected, 'colored static' appeared on the monitor. I turned off the system and tried a different VGA cable and this time, horizontal black and white bars filled the screen.
So, I disconnected the VGA monitor and reconnected his 30' Apple monitor (using the native DVI connection) and the black and white bars re-appeared.
I tried reseating the nVidia GeForce video card (I'm not sure of the exact model) to no avail. At one point, we did get the system to boot and display the gray screen with the gray Apple logo, but then the flickering vertical lines appeared along with the message about pressing and holding the power button to restart the system because of a crash. After doing this, the black and white bars appeared.
Any ideas on what could be wrong?
Thanks!
Peace..
8800

Genuine Apple NVIDIA Quadro FX 4800 1.5GB CUDA Video Card for the Mac ProManufacturer Part Number: 900-000, 900-201 1.5GB GDDR3 Frame Buffer 384-bit Memory Interface DVI-I DL + DVI-I DL + Stereo Outputs Compatible with Mac OS 10.5.7 or Later and Boot Camp Compatible with Mac Pro 3,1 or 4,1 or later. . The NVIDIA Quadro FX 4500 with 512MB of video memory as a build-to-order option. Mixmeister studio 7.6 for mac. NVIDIA GeForce 6600 LE, NVIDIA GeForce 6660, and GeForce 7800 GT GPUs each provide support for dual-displays or a 30-inch Apple Cinema HD Display. The NVIDIA Quadro FX 4500 can drive up to two 30-inch Apple Cinema HD Displays and includes other professional user features, such as a port to connect 3D goggles for stereo-in-a-window applications.

Original Nvidia Quadro Fx 5600 1.5gb Pcie Video Card For Mac
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