Well I got it and turns out the HDD was fine. I did a clean install of OS 10.2 then upgraded to 10.4 with the existing 160GB HDD and have had no real problems.
The one thing I do notice is that one of the fans is a little noiser than my other G4 tower (1.33Ghz g4 with 4GB of Ram) and sometimes the fan will power down for a second, pause, then I get a beep like a Biegebox PC starting up and the fan starts up again. It sounds exactly like a single CMOS/BIOS beep on a PC. Almost like the fan stops and reboots.
I've been around macs for a while and I've never heard a tower's fan powerdown and reboot like this. Any ideas? It's not affecting anything (as far as I can tell, just something that I noticed)

