Power Mac G4 MDD keeps going into sleep

My G4 has a strange sleep issue. I'll be working on my Mac for a good hour or so when fan starts doing an imitation of an F15 jet engine. This is then followed by screen & Mac going into sleep mode. I hit any key & comes out of sleep momentarily then goes back to sleep. No matter how many times I hit keyboard it goes into sleep again. I finally have to shutdown which is tricky as often while trying to do so, will go into sleep mode. I've disconnected all USB/Firewire devices, ran Disk Utility/First Aid, reset PMU, PRAM & replaced battery. I've also taken out 2 x 512Mb additional Non Kingston RAM but didn't make any difference.I'm thinking it's got to be down to overheating/clocking as fan noisy & heat sink gets very hot. I've heard Tech Tool can elimainate these sort of problems & fix overclocking processor speed? I've looked at discussions but couldn't see anything that matched this ailment.
Any help/advice greatly appreciated

If your Mac happily goes to sleep but won't wake up--Hold down the power switch to force-reboot your machine and get it running again.
Don't worry-your Mac isn't narcoleptic. Its Open Firmware system or NVRAM (nonvolatile RAM) is likely corrupt, and your Mac can't remember how to wake up.
Try resetting the PRAM. This should reset the NVRAM on most machines, which is the suggested fix. If that didn't help, do the following manually;
Restart your Mac and immediately hold down the Command-Option-O-F key combo until you see a somewhat intimidating command-line display that ends with the Open Fimware prompt. Type the following line:
reset-nvram
press the return key on your keyboard
set-defaults
press return
reset-all
press return
Your Mac will reboot. Once it's running, put it back to sleep to test. If the problem recurs your Energy Saver preferences may be the culprit. Delete the com.apple.PowerManagement.plist file (go to Finder/Hard drive/Library/Preferences/SystemConfiguration)--don't worry, your Mac will regenerate a new one--and then restart to see if that rights the wrong.
If you have a storage device mounted via a PCI card that doesn't support sleep read this Apple doc. Thanks Texas MacMan!
Still didn't work? Might be time to call AppleCare or see an Apple Genius or a technician.
 Good Luck! DALE

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