In my experience if the hard drive is making a mechanical sounding noise then it is on the way out. Continuous whirring is more than likely an issue with the file system and cmd+shift+u will get you to the utilities, open disk utility select your disk and verify and repair disk permissions might be a good place to start rectifying this.
If it is a bad hard drive all is not lost, one of the simplest ways of replacing a still working hard drive is to buy a new hard drive and put it into a spare slot, download carbon copy(free) and copy original drive to new drive, remove both drives and put the new drive in slot one and you are back to how you were.
Radix or others might have a better solution but with my experience (selling G5 Power Mac's and other Apple parts) this is one of the quickest solutions for those not comfortable doing more indepth instructions/processes.
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