Hello Guys, I got a little problem. I have a new aluminium macbook 2.4ghz with leopard 10.5.5, but i want to install 10.5.4. I have a dvd of a friend of my who has 10.5.4, but when I put the dvd in my macbook it won't go to the setup mode when holding the c-button. So then I am trying to installing it when am logged in my macbook, but then it's only keeps restarting over and over again. Is it possible to put 10.5.4 on the new macbook or can't I use the dvd of my friend because its only for his macbook?? Can anyone help me with this please???