My approach to fixing "dead" 1x0 Powerbooks

- Pull battery

- Leave plugged in for a few hours

- Hold down power button/rear switch, press on and off

- Should chime, then die - power up again, it should eventually get to start up.

- Plug in battery, it'll switch off

- Turn off PB, plug in battery, repeat several times

... I think the battery screws up PRAM settings if not used for a while, with trial and error similar to the above you should be able to get it to boot without the battery, then "coax" it back into recognition

JB