Good info that G3/G4 macs can read s.m.a.r.t. status, I hadn't checked on any of my systems before this, probably something that only makes itself important when a failure is imminent.

Well, my drive is definitely on its way out. After leaving the system off for a few days and then turning it back on today, it was evident I'd have to get it replaced. it's making crunching noises and generally acting like a failing hard disc, including still reporting failing s.m.a.r.t. status.

I'll call Apple tomorrow.
_________________
[Insert Cool Signature here!]