I'm trying to install OS X Leopard onto an empty hard drive with my G4 but it doesn't install. I put the disc into a DVD-R drive on my G4 and restarted the system while holding down C on the keyboard, but instead of going into the installation screen, it goes to a grey screen with nothing on it before going black then going to the standard Mac empty hard drive screen (grey screen with flashing finder and ? in the middle of the screen). Anyone know what causes this irregularity? Thanks EDIT: The installation disc was from a friend who made a copy of his retail OS X Leopard disc with a Windows 7 PC. Would that cause this or is it another issue?