MacPro starts up, but I can't see anything

Started having issues with Photoshop CS2 not wanting to startup. I would have to shutdown and kill the power. When I would restart I could hear it but not see it. I would restart once more and everything would be fine.
About a week ago, the problem stopped. Then it started back this morning - with a vengeance. Now, I nothing I do helps. I've tried different monitors, unplugging periperals, the works. But I can't see a thing.
Could it be the graphics card?

Add me to the list. I'm posting to all threads in the hope that Apple will pay attention. This has to be a firmware issue.
The problem is that four times out of five, the Mac boots to a black screen.
I believe the computer is booting all the way up, because I have the front power button set to put the computer to sleep, and when I manually power down the machine using the power button, the Mac will go to sleep first.
Also, the Mac will go into Firewire disk mode when connected to my MacBook.
My setup:
MacPro 2008, 8-core 2.8
14 GB RAM
ATI 2600
Here's what I've tried:
Reinstalling and updating OS both 10.5 and 10.6
Diskwarrior
PRAM zap
Pulling all USB and firewire peripherals off the computer -- Mac promptly booted to black screen, so peripherals are not the issue.
I have tried booting to the Apple Hardware Test on my commercial Leopard DVD and Snow Leopard DVD, but the machine will not boot to this (these disks will boot the AHT on other Macs). I no longer have the original CDs that shipped with the Mac.
I've suspected the video card, but according to posts, apparently this is not the cause.
Before this, the Mac Pro was having a related issue pertaining to VMWare Fusion, wherein the Mac would occasionally not wake from sleep, logging a VMWare Fusion kernel crash.
For the moment, I'm not shutting down the Mac Pro, just turning off the Cinema Display.

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MacPro starts up, but I can't see anything

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