Powerbook G4 Aluminum Crashes When Lid Closed

I have a 1.67 GHz Powerbook G4 (Machine model Powerbook5,6) with 2 GB RAM, running Tiger 10.4.7. I have used it without trouble for over a year. I do not have any peripherals attached to it on a regular basis and have not been using it attached to a monitor. I have not added any 3rd party apps in the recent past and have relatively few of those to begin with.
Since last weekend, I have had recurrent episodes of crashes (blank screen, fans working, overheating of the entire case) when I close the lid to make it go to sleep. When it does this, it is totally unresponsive, only cured by pressing and holding the power button to shut down. Initially, it would start back up after this. Now, restart is not allowing the screen to come on. I have done the following:
1. Reset RAM- Did not prevent recurrence
2. Reset the PowerBook power management utility. Seemed to help for a few hours but the problem recurred. Now, the only way I can restart is by resetting the PMU.
3. Ran Cocktail Pilot- Crons, deleting rotated logs, repairing permissions etc. - Still had a recurrence
4. Deleted the power management preferences .plist file- Still had a recurrence.
I saw an earlier post with a 17" that had exactly my problems but it was never answered or followed up on. Anotehr poster with similar problems said Apple told him to use only Tiger and no add on apps for 3 months and he still had the same problem. If I had to go that route, I could not use this computer.
Any help would be appreciated.
Powermac G5 Dual 2.7 GHz   Mac OS X (10.4.7)   4.5 GB RAM, two 400 GB hard drives, 30" ACD

Discovered that the computer's Energy Saver prefs had been mysteriously changed to start up during the night.

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