Screen fades to blue screen continually (video attached)

Here is what is going on. On boot the computer would lock up after the spinning gear. Or it seem to. It would get past the apple logo, flash pink for a second and go to a white screen. I could hear the hard drives being accessed but it never seemed to come out of this white screen after waiting 10 or minutes. So I ran the hardware test on this computer. It found no problems, so rebooted and oddly enough I the computer booted fine. However occasionally after being logged in the computer would flash to a blue screen and fade back in. This is the same animation you see when you log into your machine right before you see the desktop. In some cases it will continue over and over (see the youtube link bellow). Even booting off the original restore disc this issue kept continuing. Which leads me to believe its a hardware issue. Ive tried, resting the PRAM, SMC, ran the hardware test a second time, ran a check on the hard drive using disk utility, fixed the permissions, swapped out dvi cables, and changed out the power strip. I am leaning towards it being a video card issue, but i cant be for sure. The problem is intermittent, so its hard to track down. Has anyone seen an issue like this before?????
http://www.youtube.com/watch?v=jtN6pU0eW5A
Computer specs:
Model Name: Mac Pro
Model Identifier: MacPro1,1
Processor Name: Dual-Core Intel Xeon
Processor Speed: 2.66 GHz
Number Of Processors: 2
Total Number Of Cores: 4
Memory: 5 GB
Chipset Model: NVIDIA GeForce 7300 GT
PCI-E audio card: http://www.motu.com/products/pciaudio/2408/

Have you figured out the solution for this? I'm experiencing the same problem with almost the same setup.
  Model Name:          Mac Pro
  Model Identifier:          MacPro3,1
  Processor Name:          Quad-Core Intel Xeon
  Processor Speed:          3.2 GHz
  Number Of Processors:          2
  Total Number Of Cores:          8
  Chipset Model:          NVIDIA GeForce 8800 GT
  MOTU PCIe-424 2408mk3
I've just recently upgraded to Snow Leopard 10.6.3, when this blue screen issue started to bug me. I tried resetting the
RAMs and GFX card, but to no good result. I also tried to remove the PCIe-424 card, and found out that this causes to stuck the system in blue screen. I was wondering maybe MOTU has new released driver for OS X 10.6. I only downloaded the latest driver for mac which is for 10.4 and up. But whenever I'm plugging back the PCI card in, the blue screen problem still occurs and cannot continue with the installation procedure anymore.
Hope someone could give me idea on any solution for this.

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