I recently purchased an Apple iBook G4 with 1.2GHz 256MB 30GB. It came without an operating system installed. A friend gave me his copy of Leopard. It is the gray disk & the dvd. When I try to install it reads the disk then ask me what language I want. Then it says preparing to install & does nothing else. I've waited hours for it do something but just stays like that. Any help would be appreciated.