Powerbook won't boot past apple screen, disk utility can't repair

Last night I applied the most recent software updates, I don't remember exactly what they were but there was a Java update, a security update, a quicktime update and an itunes update. after the required restart, my powerbook g4 won't boot past the apple icon screen.
I can't boot it into safe mode or single user mode.
I can start it up in target disk mode and transfer a handful of files/directories at a time before it hangs.
When I try to run the repair in Disk Utility against the target disk, it gets about halfway before the following:
Verify and Repair disk “Macintosh HD”
Checking HFS Plus volume.
Checking Extents Overflow file.
Checking Catalog file.
Invalid sibling link
Volume check failed.
Error: The underlying task reported failure on exit
1 HFS volume checked
1 volume could not be repaired because of an error
the disk doesn't make any grinding or anything, just a few clicks when it tries to boot but nothing bad sounding.
Is my computer hosed? Is it worth bringing it to the genius bar?

Hi, Pat. How much time did you give DW to complete its work? Locating the data it needs to rebuild your directory can take a while — that's the step at which DW far outperforms other utilities. It digs deeper and tries harder than anything else, and that can take a long time. The longest successful DW "fix" I've seen reported here in the seven and a half years I've been participating in Apple Discussions was *14 days* of continuous work to find the necessary data and reconstruct a hard drive directory from it. That was after all other disk utilities had been tried and had failed; it was the user's last hope to save data that hadn't been backed up anywhere. If you haven't allowed DW at least a few hours to accomplish its task, give it another chance. And don't try to use the computer for anything at all while DW is working.

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    Safe mode is much slower to start and run than normal, and some things won’t work at all, including wireless networking on certain Macs.
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  • Disk utility can't repair disk, back up and restore files......I need help, I'm worried I'll lose all my photos, files etc

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