Power Mac G4 starts, gets to gray screen and shuts down

My Power Mac G4 will start up, but after it gets to the gray screen with the Apple and the spinning gear for a minute or so the computer shuts down. I have started the computer while holding down the "C" with the 10.4 OS disc in and used the Disk Utility to run First Aid. First Aid fails stating:
__*Keys out of order*__
__*Rebuilding Catalog B-tree.*__
__*The volume Macintosh HD could not be repaired.*__
__*Error: The underlying task reported failure to exit*__
__*1 HFS volume checked*__
__*1 volume could not be repaired because of an error*__
__*Repair attempted on 1 volume*__
__*1 volume could not be repaired*__
I have attempted to start computer in safe mode but it just shuts down... no difference.

Faurot, welcome to Apple Discussions
You have directory corruption on your hard drive that Dusk Utility can't repair. DiskWarrior can probably fix your problem. DiskWarrior by Alsoft
http://www.alsoft.com/DiskWarrior/index.html
 Cheers, Tom

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Power Mac G4 starts, gets to gray screen and shuts down

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