Recently my parents just bought a Macbook with Leopard on it. I own a three year old Macbook that runs Tiger. I saw this as a chance to upgrade to Leopard. I tried to install Leopard on my Macbook but it says that it can't install on my machine. I've searched various places but I've gotten vague answers. Is it because the disk is hardware specific (From what I've heard) or is it something else and I'm not getting it? Thanks in advance.