Hello I'll start off by saying I'm new to this very new.
This is what I have
GeForce 9800 GTK+:

Chipset Model: GeForce 9800 GTK+
Type: GPU
Bus: PCIe
PCIe Lane Width: x16
VRAM (Total): 512 MB
Vendor: NVIDIA (0x10de)
Device ID: 0x0613
Revision ID: 0x00a2
ROM Revision: xx.xx.xx - internal
Displays:
917W:
Resolution: 1152 x 864 @ 75 Hz
Pixel Depth: 32-Bit Color (ARGB8888)
Main Display: Yes
Mirror: Off
Online: Yes
Rotation: Supported
Display Connector:
Status: No Display Connected

Hardware Overview:

Model Name: Mac Pro
Model Identifier: MacPro2,1
Processor Speed: 2.43 GHz
Number Of Processors: 1
Total Number Of Cores: 4
L2 Cache: 8 MB
Memory: 2 GB
Bus Speed: 1.07 GHz
Boot ROM Version: MP21.005C.B01
SMC Version (system): 1.13f3
Serial Number (system): SOMESRLNMBR
Hardware UUID: CB66A6CF-2854-343C-B21A-7D4D2485030B


This is the problem
It has two dvi ports one doesn't seem to work at all. The other works with a moniter with a dvi to vga converter cable or it will work with a dvi to hdmi converter till it loads the desktop and then it losses signal and everything freezes. I'm guessing its a problem with the kext but I haven't been able to find anything with this graphics card.
Please help
Thanks