Chosen Solution
I received this iBook G4 with a password lock with no disk. I was able to rest to factory by other sites. But now I have no safari or foxfire both in dock with question mark where icon should be at. I’m only able to use wifi but just goes to iTunes due to no safari.
The question mark implies the App can’t be found. Did you delete or move some files? If not I suspect your disk is failing. Do you have an external drive which is able to boot up your G4 system? If you do try booting up with it. Make a backup of anything important, then try running Disk Utility on your systems drive to see if it can salvage it. Otherwise its’ time for a new disk or system.