IBook G4 will not go to sleep

Hello Everyone,
This is a problem I've been having for about a year but now I'm finally trying to fix it. My iBook G4 will not go to sleep. It doesn't matter what method of putting it to sleep I use. Using software to select sleep, or the power button and clicking on sleep don't do anything. Closing the lid just turns off the screen, but then the computer doesn't have power if I open it much later and is still running if I open it quickly.
After trying to put the computer to sleep, it takes several minutes to turn off, so I'm guessing something is screwed up as a result of trying to make it sleep. Additionally, although possibly not related, sometimes if just left on but unused, it will lock up so that it doesn't respond to anything (no keyboard inputs and the screen is dark) but the power is still on (caps lock light will turn on and off).
Here is what I have tried to fix the problem so far:
Reset PMU
Reset PRAM/NVRAM
Ran techtool deluxe - says everything is OK
tried without additional memory (which came with the ibook) - didn't help
tried without airport extreme card (which came with the ibook) - didn't help
tried booting in safe mode - didn't help
tried putting it to sleep when logged out - didn't help
i tried to run the diagnostic cd that came with the ibook, but it gave me error messages (both with and without extra memory)
Invalid memory access at %SRR0:00cadcbc
%SRR1:00003030
and had a flashing file folder with mac symbol and a "?"
i reformatted the hard drive and reinstalled 10.4.11 (through CD and software update) - didn't help
Does anyone have any thoughts on what else I can try to figure out the problem? The only thing I have thought of is that maybe one of the updates might be the problem, since when I got the ibook it worked wonderfully. (Sadly, when reinstalling I didn't think to check if it would sleep after each update).
Is there a way (other than safe mode) to find out if it is a 3rd party software problem or an OS problem?
Is there any way I can get the mac diagnostic CD to work so maybe that could tell me something?
Should I just stop calling it a laptop and use it as a desktop where sleeping isn't as important?
Thanks for any help you can give!!!

Hey Spherical (cool name but weird),
Now realized that I don't know the CPU speed and size of your iBook but it probably doesn't matter since they're all pretty much the same but then again....
Here's something from that post that I referenced:
It's official designation is PMU99.
http://developer.apple.com/documentation/Hardware/DeveloperNotes/Macintosh_CPUs-G4/12inchPowerBookG4/2_Architecture/chapter_3_section4.html
"Power Control IC
The power manager IC in the 12-inch PowerBook G4 is a Mitsubishi M16C/62F microprocessor, also called the PMU99. It operates with its own RAM and ROM. The functions of the PMU99 include:
*controlling the sleep and power on and off sequences
*real time clock
*controlling power to the other ICs
*monitoring the battery charge level
*controlling battery charging
*supporting the interface to the built-in keyboard ( and also the trackpad )
The PMU99 also provides the hardware interface to the keyboard. Software in the PMU99 IC scans the keyboard, then sends the data to the system in packets like those from the ADB. To the system, the keyboard behaves as if they were ADB devices"
So try detaching the keyboard and trackpad from the logic board. Be careful doing this. Email me for instructions. Be especially careful with the trackpad flex as it's real easy to mess up that socket. While you're doing that inspect the connectors/sockets for any evidence of liquid spills .
richard

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