I have a Powerbook g4 [12", 1.33ghz, 512mb of ram, 60gb hdd] that I am trying to install Leopard on. When I insert the disc, it will spin, sound like it's reading the disc, then eject it. After about 3 tries, it will read the dvd. When the installer restarts the computer, I get the folder with the "?" in the center, then it ejects the dvd and boots normally. Is there a problem with my copy of Leopard, or my hardware? When I put the disc into my main power mac [733mhz g4, 640mb ram, 60+40gb hdds] it reads it fine, I don't install it because when I was given this computer, my friend tried to put leopard on it when he reformatted it, and it wouldn't run so he put tiger on.