Computer won't boot up!  Please help.

How's it going guys, I have a powerbook G4 that I have owned for a few years now. I woke up this morning to my computer making a weird processor noise, it was a repetitive noise, and my screen was frozen. I thought my computer had frozen or something. I did a hard shut down on my laptop and my computer will not boot up mac osx. It stays Stuck on the Apple page. I've tried taking the battery out, i've tried new ram, and i've tried restarting it several times, and to no avail has my computer booted back up. I have the mac osx disc and that won't even load up. Can anyone please help me out. I'm in dying need of my laptop! Thanks! - Brian

When I try and repair the disk it reads the 74.5 GB TOSHIBA MK8025GAS Harddrive but It doesn't read the HD drive right under it. I click on the toshiba disk and i tried repairing it and it gave me an error message. The message reads : "First Aid Failed. Disk utility stopped repairing HD because the following error was encountered. The underlying task reported failure exit."
The actual disk utility window reads "Invalid node structure" in red letters. "The volume HD could not be repaired : Error : The underlying task reported failure on exit. 1 HFS volume checked : 1 volume could not be repaired because of an error. Repair attempted on volume 1, 1 volume could not be repaired.
Any suggestions? And how do i go about doing an archive install? And how do i go about using diskwarrior? Thanks guys. I really appreciate this. I need this computer up and running for school. I'm actually at my college library typing this out. - Brian

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