G5 startup: screens stay dark & drive (or fans) spinning at high speed

Good morning!
I'm new to the forum and I apologize if this has been answered in the past. I'm running a G5 and when I tried to start it, immediately the fans or drives start going into overtime. They are spinning very fast and will not slow down. In addition, the screens stay black. I made sure the G5 was not trying to recognize a disc in the tray, but it is empty. I've also disconnected all my equipment (firewire and USB)to make sure there was no "interference" with my external gear. I've tried to restart several times by holding down the startup button for 5 seconds, let the drives/fans stop spinning and then restarting, but the same thing happens. I've also tried to start in the SafeMode by holding down the Shift key, but again nothing changed. Any help is greatly appreciated!
Bart

I see there are many references to this problem. I've worked with apple care on at least three occasions. I've learned to apply each of the recommendations listed in the responses. When it happened again this morning, I was able to restart the computer with a combination of unplugging the power, re-seating the ram, resetting the smc and nvram. My question is, has anyone learned of a permanent fix for this problem? I would love to listen to whatever is recommended. Thanks.

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