Help me!!!!!!My iBook 800mhz sometimes can't wake up after sleep mode...!!

Hi everybody. I'm a happy mac user sinc 2001, and i have since 2004 an ibook G4 800mhz. Ok, everything good, the problem is that from today if i leave the ibook in stop mode for half an hour for exemple it can't wake up, everything seems dead and i have to push the power button for 4 second and then turn the computer on again. If the sleep mode duration is about 5 minutes ok, otherwise it can't wake up. whyy???? what is the problem? i reset pram, nvram and pmu, but nothing. everything else works perfectly, but this is a very important problem for me because i risk to lose my work because i have always to reboot the system.
Pleas help me!!!
Ps i'm sorry for english, but i'm italian...
thanks a lot

annihilator,
Quoting from my own post:
""It could be a PMU problem. The PMU is actually a tiny computer within the computer. 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<</div>
*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 TRACK PAD)
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""
Try resetting it:
http://docs.info.apple.com/article.html?artnum=14449
If that doesn't work try what I call a deep PMU reset.
Pull all power including the battery, push the power button to remove residual charge in soft start capacitors.
Then walk away from it for at least 10 hours.
This has worked for Macs with the PMU99 since the G3 Desktops and especially the G4 Towers (Sawtooth, GI, MD, etc)
Also:
i had a problem with trackpad that became crazy, but i unmount it from the case i clean it and now it works better than perfecty.
Could you explain this more clearly? You opened up the iBook, then
i unmount it from the case
so you removed the trackpad part itself from the upper case? the trackpad part and associated circuitry? Was it glued to the upper case? in that kind of little well it sits in? But you didn't break the plastic welds that hold the "clicker" part to the upper case?
i clean it and now it works better than perfecty.
Which part was dirty?
Richard
Message was edited by: spudnuty

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