Installed Panther successfully on the iBook (600MHz; twin FW) no problems at all, except the clock had changed to 24hr format. OT: Installed also on wife's FS iMac and encountered strange bug: lowercase 'a' wouldn't work. Turned out to be her version of the excellent 'Synergy'* needed updating. OT: Sadly couldn't install Panther on my tricked out (G4 500MHz Sonnet zif) Beige, but doubtless a hack will appear. *Synergy is a utility with great functions for using iTunes from the menubar - full control without having to go to iTunes.