23" Apple Cinema Display won't wake

I have learned alot on these forums but seldom post. Thanks in advance!
I have a G5 dual 2.0 Powermac, not sure what OS- I should know but honestly haven't updated it in a couple years. It's hooked up to a 23" Apple Cinema Display. I went to turn it on yesterday and the monitor did not come on. The comp appeared to be on, the normal sounds were coming from the machine- the eject button worked, the volume buttons were working, hard drive spinning etc. tried moving the mouse, hit space bar, etc.
The LED light on the front of the monitor is on but no picture. I checked the monitor's manual and tried resetting PRAM, checked connections, made sure there was power to the monitor.
Tried restarting the computer a few times, every time it was the same thing- starts up, normal operating sounds, Mac won't wake up.
Called Applecare, they said the steady "on" light on the monitor indicates that it is not getting a signal. Probably a problem with the Powermac (which is not covered by Applecare). They told me to connect it to a different monitor and see what happens.
I brought in my Dell 22" monitor and same thing happened except for a brief moment "Auto Detect Sleep Mode" flashes on the screen then it goes to sleep.
So it seems that the Powermac is putting the monitor(s) to sleep right away at startup. Anyone know anything I can try?

Hi-
When the LED is "On", the display is "Off".
http://docs.info.apple.com/article.html?artnum=301944
You are sure that no flashing is occurring?
http://docs.info.apple.com/article.html?artnum=88366
Does touching the Power button on the side have any effect?
How did you reset PRAM? Keyboard command?
http://docs.info.apple.com/article.html?artnum=2238
Try resetting the PMU/SMU:
http://docs.info.apple.com/article.html?artnum=86760
Can you boot in Safe Mode? To start up into Safe Mode (to "Safe Boot"), do this:
-Be sure the computer is shut down.
-Press the power button.
-Immediately after you hear the startup tone, press and hold the Shift key.
-Tip: The Shift key should be held as soon as possible after the startup tone but not before.
-Release the Shift key when you see the gray Apple and progress indicator
Can you do a single user boot?
http://docs.info.apple.com/article.html?artnum=106388
Does video display when booting from OS X install disk?
http://docs.info.apple.com/article.html?artnum=300537
Reseating the graphics card may be worth a try.
G4AGP(450)Sawtooth, 2ghz PowerLogix, 2gbRAM, 300gbSATA+160gbATA, ATI Radeon 9800   Mac OS X (10.4.8)   Pioneer DVR-109, ExtHD 160gb x2, 23"Cinema Display, Ratoc USB2.0, Nikon Coolscan

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