I am selling my 2 year old iMac. It came installed with Leopard 10.5, and I have the original DVD's. I recently (about a month ago), upgraded it to Snow Leopard. I was looking at this site: http://www.macosxhints.com/article.php?story=20090805215651603 To get some ideas on how I can completely reset the system, to almost a factory install. Would I have to follow the steps to a full system install of Leopard, and then install Snow Leopard upgrade? Or can I use the Snow Leopard disk, to directly install that version as the clean install? At the end of the process, I would love to leave the system as "new" as possible.