Hi all i have an issue i hope someone can clear up for me. I have an old 2008 macbook pro, iv had for years.It came with mac os 10.4 with 512 ddr 667mhz ram which iv just replaced with a 2gig single stick (2g ddr 667 mhz). I have a installation disk of leopard with the applications disk, the disks say on them 13 inch macbook pro mac osx install disk and applications. Iv tried to use the disk to upgrade to leopard but during install it comes up this cant be done on this macbook!!! Is it because the disk is meant for a 13 inch or is it something else. All this is because i recently bought a iphone 4s with ios5 on and it wont connect to my mac in itunes or other so got to upgrade itunes and to upgrade that iv got to upgrade to leopard......vicious circle