Dead Lombard 400 - Sleep LED Lights

I have a dead Lombard 400 that I am trying to revive for a friend to use as an email machine.
When I connect the power adapter the sleep LED lights and stays on but the machine will not boot. Pressing the reset button causes the LED to go out; when the reset button is released (after 5 secs or 30 secs) the sleep LED blinks once and then goes dark. The machine will still not boot. I've tried this with both with and without a fully charge battery in the bay with the same result.
The same behavior occurs if I try to boot with a fully charged battery and no power adapter - sleep LED llghts, blinks once after a reset but the Lombard will not boot.
Some of the other things I've done:
- Checked the internal rechargeable battery. It's currently showing 3.6 volts. Since this machine hasn't been used/charged in 2-3 years and it's main battery was dead, I wonder if it has been recharged by the power adapter or the fully charged main battery I installed. I've tried all the above tests with this battery disconnected.
- Discharged the battery from my good Lombard 333 to 50% and installed it in the Lombard 400. Plugged it into a known good charger and left it on charge overnight. When I reinstalled the battery in the Lombard 333 it was still at 50%.
- Dis-connected the keyboard and tried all the above booting scenarios - still nothing.
- Swapped out the processor board with the one in my good Lombard 333. Still will not boot. 400 MHz processor boots perfectly in my 333 machine.
- Disassembled the machine and inspected the Power/Sound card and Power Supply card. No visible problems on either and the charger connector on the Power/Sound card has no wobble at all and the solder joint looks solid.
Before I start the tedious process of swapping parts between the good and bad Lombards to determine which part failed, does anyone have any other suggestions?
Thanks

wjb5,
Sorry, little help from my end. To answer your question...
"Checked the internal rechargeable battery. It's currently showing 3.6 volts. Since this machine hasn't been used/charged in 2-3 years and it's main battery was dead, I wonder if it has been recharged by the power adapter or the fully charged main battery I installed. I've tried all the above tests with this battery disconnected."
...the internal backup battery is charged by the power adapter. I would guess charging a main battery involves different circuitry.
Since you have tried all the basics, and according to Apple, it could be the sound/power card or the power supply card or the microprocessor card or the I/O logic board. You have already eliminated the microprocessor card. Apple says if the battery will not charge, it is either the power supply card or the I/O logic board. If I were going to take a shot at which card to test first, the power supply card seems a good candidate.

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