Pismo shuts off during sleep-mode

Hi
I realized that my Pismo occasionally shuts off while in sleep mode. When I press a key to wake it up the pulsating green light turns off and I need to press the on/off-key. The computer then reboots normally.
Thanks! Felix

Hi
In meantime, it is not "occasionally" but always.
1. PMU-reset with the small button on the rear did not help either.
2. I believe I cannot hear the HD after opening the lid. The flashing green light turns off. I simply press the on/off-button and the Pismo starts up as if I turned it off.
3. HDD is new, Seagate 120 GByte.
Actually a few weeks ago I obtained a Pismo with a defect power borad and swapped CPU-cards due to my bad L2-cache. Worked great!
Afterwards I realized, that the casing of the other Pismo was in much better shape (mine has a crack next to the bottom Apple-logo and a very shiny upper part). What I finally did was the following:
Stripped both down to the point where practically the logic board and metal frame was the last part in there.
Built up on the lower part of the ebay-Pismo with my power-board and practically all other parts from my own functioning Pismo and with the new HDD. Upper case and keyboard is from the ebay-Pismo, which was apparently used very little.
I guess I will take everything apart again and make sure that my own logic board runs in there. Maybe the logicboard of the eBay-Pismo was damaged together with the power boards and AHT doesn´t recognize it (System Profiler shows an error with regards to the sound system, but sound works).
Strange, if I could only tell whether this is hardware related.
Thanks for any input
Felix

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