Problems booting a PowerBook G4 15"

Computer was being used on a hospital website to fill out applications (employment) and froze, remaining stuck in Safari with the rainbow disk spinning in place of the cursor. Was unable to force quit, forced computer to shut down instead and left. Next time it was booted up, it stopped loading at the apple screen with the rotating pinwheel. That happened the first few times it was booted, then it switched to a file image flashing between a question mark and the OS logo on a gray screen. Now all it does is stop at a white/light gray screen with a gray apple on it. I have no idea what to do. I have already tried booting up into safe mode, but it just stays at the white screen with the apple.
Please help if you can. I'm at a total loss, and the computer is needed fully operational asap.
Please also warn if solution will wipe drive, as that would be a last resort.
Thank you very much for your time, and I appreciate any help that I can get.
~Emily
P.S. Tiger system was recently installed (yes, we are behind the times...), and my mom says that it has been rather sluggish and reluctant to load new pages in Safari. Not sure if this has anything to do with anything, but I figured any info I had might help figure this mess out.
Thanks again!
~Emily
Message was edited by: Ink_Slinger

Emily:
Thanks for posting back with an update. Your answer is very useful in helping me to understand what is going on with your computer. Disk Utility reports "Underlying task reported failure" when repairing a volume is a serious directory issue which Disk Utility cannot repair. When you read the linked article you will note that the first recommendation is to backup your data, which is what you are planning to do. You can connect to a second Mac that supports firewire and boot into Firewire Target Disk Mode and backup your stuff on the other computer. If you need help with this please post back and ask.
Since Disk Utility cannot repair your HDD you will need to use a utility like Disk Warrior or Tech Tool Pro to be able to do the directory repairs. Another option would be to completely reformat your HDD and reinstall, after you have backed up your data. If you need assistance with this, please post back and ask.
All is not lost. There is still an excellent chance of getting your computer back in working order, although it will take a bit of work.
Good luck.
cornelius
Message was edited by: cornelius

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