Can anyone help me repair my internal hard drive?

I think I may have shut down my Imac at a bad moment (using the button on the back) and created a problem with the internal hard drive directory. I connected my powerbook to the Imac, using it as an external drive and ran 'Disk Utility' on it. I got:
'Invalid node structure
Rebuilding Catalog B-tree
Error: the underlying task reported failure on exit.
1 HFS Volume checked
1 Volume could not be reapired because of an error.'
So I then used a (slightly old) copy of Diskwarrior 3.0. I pressed 'Rebuild' and it came up with:
'The directory of the disk 'Robsters Imac' cannot be rebuilt. The original directory is too severely damaged. The disk was not modified (2155,2179)'
I know it looks bad, and the first thing some might say is 'get a new harddrive/ computer', but it seems strange that one bad force quit and a slightly damaged directory means the drive is now garbage. Any ideas on any other course of action?

The problem is your version of Disk Warrior is too old to work. You must use version 10.0.3 of Disk Warrior version with OS 10.4. Earlier versions will not work and will give you an error message if you try to use them. The earlier versions don't damage anything, they just can't repair the directory as you have found out.
It is a free download. You will have to have your current copy and a CD burner to use the new version. There is an excellent chance that with the latest version of Disk Warrior you will be able to repair the directory.

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