Have you asked your friend whether the PB was working when it went into the closet? If it was not, whether the fault was known? Had it then, or since, been an organ-donor? There is so much that could be a terminal fault that no-one who has not the PB in his hands could guess at. The advice that you have received so far is premised on the idea that the PB is capable of working. If you can get hold of the Apple Service Source document used by AASPs of the time you can at least discover whether all of its parts are present, and whether there are gross disabilities that you haven't yet reported. Does the floppy drive sound active with a disk in it? If it doesn't boot the PB, how are you getting the floppy disk out?
Are you still getting the repeated POST chime with the new battery and AC adapter? Are you getting any chime now? If the PB does not have an essential component that you do not yet know to be missing, you have a ready-made reason for its present behaviour. If the daughtercard or the inverter board, as examples, are missing, you could speculate from the outside forever as to the cause of the problem. That is why you must look at the PB's insides and tally its contents, check the connections, and close it knowing that everything is mechanically ready to go, if not electrically. Your foray inside must also include an inspection of condition: general cleanness and freedom from corrosion and gunk, especially around the battery contacts in the battery bay and on the MLB. Dead shorts and missing traces contribute nothing to the PB's function.
Having given your PB a working battery and adapter, a valid startup volume and a PMU reset, but not been rewarded with startup, you are now faced not with troubleshooting but with rescue from disaster. As the bloke on the spot, only you can see what may be wrong, so you have to get the data to recognize the problem and formulate a response. We at a distance can only encourage you to persist until you are successful, or reach a terminal impasse.
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Are you still getting the repeated POST chime with the new battery and AC adapter? Are you getting any chime now? If the PB does not have an essential component that you do not yet know to be missing, you have a ready-made reason for its present behaviour. If the daughtercard or the inverter board, as examples, are missing, you could speculate from the outside forever as to the cause of the problem. That is why you must look at the PB's insides and tally its contents, check the connections, and close it knowing that everything is mechanically ready to go, if not electrically. Your foray inside must also include an inspection of condition: general cleanness and freedom from corrosion and gunk, especially around the battery contacts in the battery bay and on the MLB. Dead shorts and missing traces contribute nothing to the PB's function.
Having given your PB a working battery and adapter, a valid startup volume and a PMU reset, but not been rewarded with startup, you are now faced not with troubleshooting but with rescue from disaster. As the bloke on the spot, only you can see what may be wrong, so you have to get the data to recognize the problem and formulate a response. We at a distance can only encourage you to persist until you are successful, or reach a terminal impasse.
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