Quicksilver doesn't wake up after sleep

Recently (over the past month or so) my Quicksilver G4/733 has developed a problem where it sometimes (about 20% of the time) will not wake up after going to sleep. Tapping on the keyboard to wake up, for example, results in no reaction from the computer other than my FireWire DVD burner clicking a few times. Using the power button to wake up causes the button to glow and fade out with no other reaction from the computer (except the FireWire drive).
To get the computer to start up again, I cut the power for about a minute (usually by turning off my power strip) and then attempt to start up. If I only cut power for a few seconds, the computer exhibits the same unresponsive behavior.
I have not upgraded my hardware or system (other than automatic Software Update) or installed any applications in the past few months.
Thanks in advance for your help.
Quicksilver G4 Mac OS X (10.4.6) 512 MB RAM, 120 GB + 80 GB HDs, SoundSticks, Keyspan Remote, LaCie DVD burner

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-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 did'nt work? Might be time to call AppleCare or see an Apple Genius or a technician.
Cheers!
DALE

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I'll try to document my issue a bit better.
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Quicksilver doesn't wake up after sleep

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