If you had your restore disk, you could boot from it and then try stuff.
The alternative would be if you can find someone that has a Mac with a FireWire port and cable and use it in Target Disk mode to access your PowerBook, then run Disk Utility on the hard drive: see if that wouldn't help.
Or find a full install disk of Tiger, boot from it by holding down the C key and repair the disk with Disk Utility.
Another would be to run DiskWarrior on your PowerBook.
A few things to try:
- starting up in Safe Mode, by holding down the
Shift key then restart normally
-
reset the NVRAM/PRAM
- booting into Open Firmware by holding down the
Command +
Option +
O +
F. This will boot your PB with a Terminal-like white window where you need to type at the prompt:
reset-nvram
hit the
Return key then at the prompt type:
reset-all
then hit the
Return key to restart normally.
Let us know how these go.