Disk failing to mount after failed repair

My g5 1.8dp is running 10.5.6. SInce I upgraded to Leopard from 10.4.11 it's been sluggish, quite unresponsive and programs are giving me the beachball a lot more often and for longer. I decided to run disk utility.
It told me I needed to repair the disk after verification highlighted some errors with "nodes. I booted from my install DVD and ran disk utility from the disc. Repair failed and now I can't remount my startup disk.
Any advice greatly received.

Plastic Gangster:
While an exact copy of the error message you got from Disk Utility would have been helpful, your computer apparently has directory issues which Disk Utility cannot repair. Under conditions like these using a utility like Tech Tool Pro or Disk Warrior may be able to do the repairs DU can't.
There is a possibility that the HDD itself may be failing. If the HDD is three years old or more, I would consider replacing it. In any case, I suggest that you take immediate steps to secure your data. If you do not have a current backup of your data, that should be your first priority. If you do not have or do not wish to purchase one of the utilities linked, you could consider backup and reinstall, possibly using Archive and Install or Erase and install.
cornelius

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