I've decided I want to install Tiger on PowerBook G4 (latest model model, 1.67ghz, 1gb DDR2...) over the current install of Leopard. Whenever I boot the install CD it stops at the blank blue screen right after the grey Apple logo. The superdrive keeps going for about a minute then it stops and stays there forever. I've used the disc before so I know it works, and the PowerBook stops at the grey Apple logo with my panther install Cd's too. There is no issue using the superdrive for watching movies so I'm guessing it works fine. Anyone know what might be going on? EDIT: just thought I should add that both the Tiger and Panther CD's are readable by Leopard, when they're on the desktop I can browse the files and click the restart button so it boots off the CD.