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?