Start-up problems after Discwarrior

Having experienced start-up problems on my iBook G4 (late 2004, OSX 10.3.9), specifically the dreaded grey screen and the disappearance of my hard-drive, which neither Apple Hardware Test nor Disk Utility could resolve, I called in outside help (an Apple-certified engineer) who said I needed to run Discwarrior.
Discwarrior ran for 10-12 hours, after which my directory was rebuilt and my hard-drive reappeared. Then I proceeded to perform an "Archive and Install" of OSX, as recommended by the engineer.
However, my iBook still only starts-up as far as the grey screen. I should add that when I start-up from the installation disc, when I select the option to change start-up discs when quitting, my hard-drive isn't listed as one of the options.
basically, my iBook won't start up from the hard-drive. I think. Any suggestions, anyone?
iBook G4 Mac OS X (10.3.9)

Hi, Nic. Since your drive can't tell you directly when it's failing as newer drives can, you will have to watch for and interpret indirect indicators (like the rapid re-corruption of your HD directory), or else buy diagnostic software (such as TechTool Pro) that can test the drive thoroughly. But since TTP costs as much as a new drive, I'd suggest instead that you simply buy a new drive and (separately) an external FireWire enclosure for it, boot to your Panther installer disc 1, use Disk Utility to format the drive, and install Panther on it. Then boot to the external drive and copy your data from the internal drive onto it. Shut down and swap the two drives: old internal drive into the external enclosure, new drive into the iBook. Boot to the internal drive, connect the old drive, and use Disk Utility from the internal drive to reformat and completely zero the old drive. If DU can't complete that zeroing process successfully, the drive is bad, and you should replace it with another new drive in the external enclosure, on which to keep all your data backed up at frequent intervals.
Chances are that the new problems you've experienced since replacing your HD directory with a new one created by DiskWarrior are due to a progressive failure of the hard drive, leading to increasing corruption of the new directory almost from the moment of its creation.

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