I currently have the 2008 unibody Macbook 2008 running Snow Leopard that I want to sell. However, I lost the install disk. Is there any way to rproperly sell this computer without having the install disk? And if I have to buy a new disk, should I just rebuy the Snow Leopard, or get something else? This computer is 2ghz intel core duo with 4gb of ram. Thanks in advance!!