How do I fix a volume if  Disk utility says cannot be repaired?

Greetings all,
Am having some annoying issues with my PowerMac G5 hard drive, nothing very specific, just lots of small issues like crashes and hangs and the fan going into hyper-drive every now and then. Started up from my system disc/Disk Utility and ran repair permissions and repair disc.
On repair disk it gets to the end then says:
1 HFS volume repaired
1 volume could not be repaired
I cannot find out what this means so can anyone advise?
I also run repair permissions over and over and it never stops finding something to repair.
Any advice much appreciated.

Started up from my system disc/Disk Utility and ran repair permissions and repair disc.
Do you mean the System install DVD? - that's what you should do as you cannot repair an HD you're booted from.
On repair disk it gets to the end then says:
1 HFS volume repaired
1 volume could not be repaired
This is a little odd: is there another hard disk connected? Or possibly it was trying to repair the install disk as well?
I also run repair permissions over and over and it never stops finding something to repair.
Repairing permissions does thrown up a lot of things which can't be repaired: this is a bug arising from a system update and is harmless: you can ignore it.
You could try downloading Applejack which you run in single-user mode and provides an easy way of using the built-in disk repair procedure: this is quicker than starting from the DVD and you won't get any confusion with the DVD. It's quite safe: it doesn't do the check itself, just invokes the repair that you would get by typing arcane Linux codes. But note that you must run it only in single user mode (starting up and holding command-s while booting), never while booted normally.

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