iBook G4 shuts down after bootup.

[Open Minded]

Hey guys, I'm working on an iBook (1.33 GHz 768 meg of RAM) for a friend. The Apple sound and grey screen come up, it's loading... then shutdown. I have a Mac Mini G4, so I busted out a Tiger install disk. I went into the startup manager and selected for the computer to boot from the 10.5.8 install that was on the hard drive. Loads right up. If I don't tell the computer to boot from the DVD, the same thing will happen and it will just shut down. If I load Tiger and tell it to boot from the hard drive, it will boot. I've done this twice now to confirm it was not a fluke of some kind.

I updated the software after I changed the time (was set for 1971 ?) I've also reset the PMU trying a few different ways. I've pulled the battery and held the power button for 5 seconds. Still same results.

I really don't want to wipe the OS.

Any ideas on how I can get this working correctly?

Thanks in advance!

EDIT:

Running disk utility. Fixing permissions. There seems to be a lot of errors so far...

EDIT 2: Invalid leaf record count. Invalid node structure. Volume check failed.

[Open Minded]

Anyone? I'm running out of things to try. :/

[Brian M. Veteran]

http://www.alsoft.com/diskwarrior/

[Open Minded]

I've been reading about that program. Not really ready to spend money on software yet. It might come to that, though.

Right now, I'm going to hook both my Mini and the laptop to the router so I can backup her files faster than wireless.

If I zero the drive and redid the OS, would that fix the boot problem? The thing that stumps me is it will boot right to the desktop if it loads a DVD before boot. I know the battery is bad, would that have something to do with this problem?

[Open Minded]

Update: Found an unused 10.5 disk, zeroed the drive and installed. Works great so far. Got all the data back on it and have done a few power cycles to make sure it will keep booting. I've also ran the disk utility and it's reporting back no errors.

Thanks Brian for linking to that, though.