Hi, Gary it’s me again and i need this questio solved as soon as possible. Ok i bought a second-hand macbook for this guy recently. Ok i was wondering, how do i change the password? the owner said he forgot it. The computer doesn’t come with the installation disk. Any suggestions? should i buy a Tiger installatin disc? also what if i upgraded my macbook from tiger to leopard, will the leopard disc work or do i need tiger still?