Power Mac G4 MDD not powering up after battery change and pci reset

First my clock was off. Then iTunes 9.0.3 problem - error message 'this copy of iTunes is corrupted or installed incorrectly. Need to reinstall.' I uninstalled iTunes according to the KB instruction. Then 9.1 install failed. This is the beginning of nightmare. Everything I tried failed thereafter.
I thought the low battery might be partly or solely responsible for this behavier. So I bought and installed a new battery. After that my Mac was OK for about one hour. Then I was trying to use Disc Utilities using the installer disc to check the HD's health. It failed. I started up to the internal OS. I used fsck. Came up the message saying 'This volume of the HD could not be repaird.' I repeated restarting a few times altogether. Finally, it quit booting. Precisely it boots up to gray screen with Apple logo with a daisy spinning underneath (for a long time). Then the screen turned blue and a cursor blinked periodically. Tried a couple of more times. Same thing ...
So I reset the PCI (PMU). Nothing has changed. Same pretty blue screen. Where can I go from here before I head for Apple Store. Please help.

I believe that the directory on your hard drive is corrupted & Disk 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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    Hi-
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