On 12/14/07 9:06 AM, K. Jerry Smith <explorerguy at mac.com> wrote: > I have a friend who attempted to install Leopard on an 800 Ghz TiBook. > Officially, the highest version of the OS that can be installed on > that model is 10.4.11. He called Apple, and was told Leopard would > install on it, though, and purchased the new OS. Leopard's minimum sytem requirements for G4 processors are a speed of 867MHz http://www.apple.com/macosx/techspecs/ This requirement rules out installation on an 800MHz TiBook (which I think is what you meant to type instead of 800GHz) http://www.appleinsider.com/articles/07/09/24/updated_leopard_requirements_t o_exclude_800mhz_systems.html