I have thought all along that it is the logic board. I'm on Pismo logic board #3 myself. I have used it on a daily basis since 2002. It just keeps going and going with the occasional repair.
Consider looking for a "for parts" complete or nearly complete Pismo laptop, you might score a great deal. This is a great source now and in the future from which to harvest parts as you need them. I have accumulated 2 spare Pismo LCDs, various boards, and a bunch of case plastics from these sorts of things. I don't have any spare logic boards that work though!
From your description, my guesses are as follows:
85% chance logic board
10% power supply board
5% something else
0% chance processor board (Verrrrrry unlikely)
From what I understand, 400 and 500 MHz logic boards are identical - either will work. But Lombard boards WILL NOT work, not even close. You can tell by looking at the connector where the processor board connects. Pismos have the big beige rectangle and Lombards have 2 long skinny connectors.
Consider looking for a "for parts" complete or nearly complete Pismo laptop, you might score a great deal. This is a great source now and in the future from which to harvest parts as you need them. I have accumulated 2 spare Pismo LCDs, various boards, and a bunch of case plastics from these sorts of things. I don't have any spare logic boards that work though!
From your description, my guesses are as follows:
85% chance logic board
10% power supply board
5% something else
0% chance processor board (Verrrrrry unlikely)
From what I understand, 400 and 500 MHz logic boards are identical - either will work. But Lombard boards WILL NOT work, not even close. You can tell by looking at the connector where the processor board connects. Pismos have the big beige rectangle and Lombards have 2 long skinny connectors.