FW800 won't sleep -- shuts down instead...

So there are many here who are having sleep/power control related problems, however I'm having a slightly different problem. As the subject line states, my FW800 Dual G4 won't sleep. Rather, when I select sleep it simply shuts down.
I have replaced the battery, reset the PRAM, reset the PMU, and reset the NVRAM, without success.
I suspect, however, maybe it's related to software as I can load up new system software and everything works fine. By the time I update everything to the latest software, including iLife, it no longer sleeps.
Short of taking the machine in, does anyone have any further ideas?

I have this;
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.
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.
Still didn't work? Might be time to call AppleCare or see an Apple Genius or a technician
Cheers! DALE

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