To put a fly in your ointment: I used a Power Mac 5500 as a server from 1997 to 2005, and 3 G4s from 2000 to 2005. Never shut them down. They were still going when they were replaced by Dell servers. I repaired Macs for a school district and rarely had a power supply problem. They were usually left running in the computer labs. For what it's worth. Nate -------------- Original message ---------------------- From: jonny <g4 at salemoregon.com> > >I've spent 29 years in the semiconductor industry and > >have qualified many product after various "stress" > >tests. > > > >No-one has ever suggested a "turn-on, turn-off" test > >:-) > > > >We do however perform accelerated life tests at above > >normal Voltages and temperatures. I have to tell you > >that semiconductors DO wear out with continuous usage. > > > > <snip> > > Thank you, John <all>...for an interesting & informative thread. > > I'm going to begin shutting down when I'm through for the day, and > sleeping when I'm inactive. I used to do this ALL the time, then for > whatever reason, I stopped doing it about a year ago. > > Thanks for the reminder to protect my mac AND conserve energy. > > jonny