Hi Mary, I'm afraid if you have a Ti Powerbook with only a G4 processor, you won't be able to run Leopard, which, I believe is 10.5, the highest you can run is 10.4.11 You need the intel duo processor to run leopard. :( Are you running a powerbook g4? Kent "A person who won't read has no advantage over one that can't read." - Mark Twain "Outside of a dog, a book is man's best friend. Inside of a dog, it's too dark to read". -Groucho Marx