I'm running a 2001 Titanium PowerBook (500 MHz) on 10.5 - I had to put the drive in another computer to install it though. I think if the processor is over 1Ghz the installer will work on a G4, but that's the end of the line as far as OS upgrades. Marty Knapp > You can run a G4 under 10.5??? > > Bob > >