Wallstreet (M4753) Won't Power-up!! (After PMU Reset)

Problem: The Wallstreet "died" (Screen slowly faded then power shut down) while I was trying to install a new IDE hard-drive. I have removed the hard-drive totally so I can focus on re-booting from DVD Drive. To restart I have tried:
1) The 4 key PMU reset command -- causes Wallstreet fan to run, LED blink, and then all stops.
THEN:
2) Holding the Power button down while holding "C," but doesn't produce any activity of drive, Processor, fan anything!
Any suggestions? Thanks!

Sumer,
If you do not have a startup chime, the powerbook's Start Manager is not passing its startup hardware test. Since the screen slowly faded and the powerbook shut down, I can only assume you have had a hardware failure.
This is what Apple recommends for a no-start (battery and power adapter can be eliminated as culprits):
Disconnect internal keyboard and try powering up unit. If unit powers up, replace keyboard.<<</div>
I would say this has zero possibility of being the failure. Performing a successful power manager reset usually eliminates the keyboard.
Verify that microprocessor card is firmly seated in connector.<<</div>
Replace sound card.<<</div>
This is the DC/sound card which has the power adapter port. Even if this fails, the battery should still power up the 'book. Also, if the battery charges, this card is probably OK.
Replace power supply card.<<</div>
Replace PMU card.<< </div>
Replace I/O logic board.<<</div>
Replace microprocessor card.<<</div>
I have no idea how the user tests for a failure in the last four components. If you really like your Wallstreet, you might spend $60-100 to have someone diagnose it, then buy/replace the parts yourself.

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