I completely wiped the HD on my 15" Powerbook G4. I went to reinstall, and found that the second install disk (Tiger 10.4) is broken. I've already loaded the first disk and its asking for the second disk that I can't use. Is it downloadable? Will apple send me a new one? Apple store? Any suggestions would be amazingly helpful. Also, can a Powerbook G4 support the Leopard operating system? I'm thinking of upgrading one I figure out where to get a new second install disk. Thank you!