Beautiful ladies and respected gentlemen, I was wondering if there's an "how to" that explains in detail how to upgrade tiger to snow leopard. I have the new macbook pro and have upgraded it to snow leopard successfully and never looked back since. My friend has a white macbook running 10.4 (tiger) and has bought iLife '09 but cannot install it without leopard/snow leopard. Im trying to install it for her but, contrary to popular belief, its not as easy as it sounds. I booted tiger -> popped in snow leopard (upgrade disc) -> installer rebooted -> i selected the language -> then Error: "Mac OS X Cannot be installed on this computer" I even tried booting from the original tiger OS discs to format the HD before doing a 'clean' install of SL. Still no luck! Apple must have introduced new checks before authenticating installation! Any help would be greatly appreciated fellow mac people!