My wife recently purchased a new Mac Book and it came with a OS X 10.5 installation CD which I promptly slotted in my old PowerBook G4 1GHz laptop hoping to get some free Leopard action. After it restarted the PB to begin the installation process, nothing happened, just a lot of CD drive reading noises and the beach-ball timer on a blank screen. I had to power-down the computer and eject the disc to restore the PB to normal. Was I hoping for too much? I tried a clean install (hold C down when powering up) but the same happened, nothing. I know you can't jump from 10.3 to 10.5 but surely with a clean install anything is possible?