I think the PMU may have been corrupted also.

I know you have reset it but maybe not waited the 5 seconds.

Here is the power manager reset for the Lombard:

PowerBook G3 Series (Bronze Keyboard) (M5343)

1. If the computer is on, turn it off.

2. Press and release the reset button on the rear of the computer. The reset button is located between the external video and modem (RJ-11) ports.

3. Wait 5 seconds.

4. Press the Power button to restart the PowerBook computer.

Note: When you reset the Power Manager, wait at least 5 seconds before pressing the Power button to start up the computer. If you do not wait at least 5 seconds, the reset procedure may fail. (If you suspect that the reset procedure has failed, press and release the reset button again and wait 5 seconds before pressing the Power button.)

http://docs.info.apple.com/article.html?artnum=14449

Stewie