Displays no longer recognised, it is my video card?

I have two Dell 22" widescreen monitors, and two computers plugged into both them via the DVI and VGA inputs. One is a 2x3.2 GHz Quad-Core Intel Xeon Mac Pro and the other is an older G5 PowerPC, both are running Leopard, the G5 is on 10.5.4, the Mac Pro is on 10.5.8.
I have them set so that the DVI input on the left monitor and the VGA input on the right monitor is for the Mac Pro and the remaining inputs are for the G5.
This has worked perfectly for the last year, and allows me to switch views between our loading station (the G5) and are encoding and graphics station (Mac Pro, got to love multi-tasking staff).
Unfortunately this morning, the Mac Pro is not showing on the monitors. I can hear it power up fine, and the monitors work fine for the G5.
I have screen sharing on the Mac Pro so that I can check on rendering status from other rooms. Usually it defaults to the dual screen view but this morning, the desktop picture has reverted to the standard blue background and the display is set to 1280x1024, but at least I know the computer is working.
Going to About My Mac, more info, Graphics/Displays shows
Display:
Type: Display
Bus: PCIe
Slot: Slot-1
PCIe Land Width: x16
Vendor: ATI (2x1002)
Device ID: 0x9580
Revision ID: 0x0000
Kernel Extension Info: No Kext Loaded
Displays:
*Display Connector*
And then there is nothing listed (whereas on the G5 this lists the Dell monitors)
Does anyone have any troubleshooting suggestions? Or better yet, answers? Is it the video card?

Same issue here, My Mac Pro will not wake monitors from sleep (intermittent). This is a huge pain in the rear. I use my Mac Pro as my alarm clock. System wakes at 6:45, Apple Script kicks off from iCal at 7:00 and starts iTunes and pull up the weather and news. As the speakers are integrated with the display when they do not wake from sleep, I wake up late.
I can connect via ARD when the Mac Pro is in this state, System profiler says there is no Kext loaded. When quit system profiler then enter the shell and do a "sudo kextload /System/Library/Extensions/ATI2600Controller.kext" and then restart system profiler it is the same result No Kext Loaded.
This all screams Firmware or Booter issue to me. The system does not cast any Blinking Power Led Errors (or tones), The System Chimes Normally but does not go to a happy gray screen that is the booter loading critical Kexts.
Below is my System Profiler from when the Kext does load correctly. Please include your System profiler report when your Mac Pro is in a working state as well.
I still love My Mac pro... but I cant afford to be late to work any more...
Hardware Overview:
Model Name: Mac Pro
Model Identifier: MacPro3,1
Processor Name: Quad-Core Intel Xeon
Processor Speed: 2.8 GHz
Number Of Processors: 2
Total Number Of Cores: 8
L2 Cache (per processor): 12 MB
Memory: 4 GB
Bus Speed: 1.6 GHz
Boot ROM Version: MP31.006C.B05
SMC Version (system): 1.25f4
Serial Number (system): G88121DFXYK
Hardware UUID: 6E2841E8-6549-5CC0-B6FC-586351C3E43B
Graphic/Displays
Chipset Model: ATI Radeon HD 2600
Type: GPU
Bus: PCIe
Slot: Slot-1
PCIe Lane Width: x16
VRAM (Total): 256 MB
Vendor: ATI (0x1002)
Device ID: 0x9588
Revision ID: 0x0000
ROM Revision: 113-B1480A-252
EFI Driver Version: 01.00.252
Displays:
VGA Display:
Resolution: 1600 x 1200 @ 60 Hz
Pixel Depth: 32-Bit Color (ARGB8888)
Main Display: Yes
Mirror: Off
Online: Yes
Rotation: Supported
Display Connector:
Status: No Display Connected
Ps. it is happening right now and I only caught it because I could not sleep and decided to check my email... monitor is not awake... but I am

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