PowerBook hangs on waking with closed lid with 10.4.8

Hi,
Since updating to 10.4.8 (PPC combo), I have the problem that on plugging in USB mouse, keyboard, DVI-screen and the power plug with the lid of my powerbook 12'' 1,5GHz SD 80GB closed, the external screen awakes and shows a blank blue screen. No mouse, no further reaction. Disconnecting everything, the pb falls asleep again, but is not accessible after (awaking on opening lid with all connections off shows black screen). I have enabled the security option that you have to provide your user name and password to access the computer.
This happens occasionally, also with a VGA screen, with or without ethernet connectivity. The only thing that seems to work is to force quit the computer!
The strange thing is that it worked for all other 10.4 versions before. It seems to me that the log-in window is not loaded...
Is there anybody experiencing the same problem? Any work arounds?
Markus
PowerBook G4 12'' SD 1,5GHz   Mac OS X (10.4.8)  

This isn't really a hack, or even an intentional thing, but it might be a solution.
I noticed last night that when I closed my MBP lid, it didn't go to sleep. Not only did the light not start blinking, the system was still up and running on my external monitor. I did a restart. Tried again, with no external monitor. Same thing. No sleepy.
I then turned off all 3rd party software in my login items. Sure enough, went to sleep. Turns out it was Temperature Monitor, a program that checks the temps of your sensors. I had had the HD sensor set to check every 10 seconds, so they couldn't go to sleep. I am not suggesting this is a good idea, but it might work for what you want it for, at least now and then. I removed it from my login items, re-set the frequency to every 10 minutes, and it slept fine. I want it to sleep when the lid is closed, to avoid the chance of overheating it, which is probably why that setting is not included in the OS.

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