I 'm from the old days when I had a Hd in GS and also had mac 8.0 but sometime sleep would do weird things or would not start up .I would just shut down at night but it would stay on from 6:00 am tell around 10:00 p.m. now with jag or Panther it has that screen saver. My G4 and B&W stays on 24 7 I turn off all the sleep stuff . they have been on for 2 years other when I do updates or we have thunder storms . Also On Panther this lets it do it maintenance thing at night Michael & Sharon Vogt <><.