Powerbook 5,7 boots only after pmu reset, does not wake up from sleep

Hello,
my PB 5,7 wont boot normally. I got to reset the pmu every time i try to power on, even when i put it into sleep it will not wake up - only after the pmu reset.
What i tryed until now is:
reset pram, disconnect: HD, optical drive, PC Card, Soudboard, Airport, right USB board, left USB Flex cable, fans – no other reaction.
I changed: Topcase with keyboard, DC-IN board, power cables, batterie cable, RAM and right USB board with the pram batterie - every time it will only start with the pmu reset.
I installed a new tiger system and also a new leopard from orig. DVDs and updated both via Airport with the combo updates.
Now i dont have any further idea. Every help would be appreciated! Did i have overseen a crucial thing? Thank you all!
Must I replace the Logicboard?
Best regards
siebo

Hallo,
yes I run the AHT. There came no error message. For the AHT my Powerbooks seems totaly ok. And I also reset my Mac's PRAM and NVRAM without any results.
But thank you for your suggestions!
regards
siebo

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