Hi all I am selling my MBP and I have lion os. I called Apple Care to find out how to best clean everything off my mac and then I can give it to the buyer. Apple told me that I cannot give my mac with my current Lion OS on it. They said I would have to go back to snow leopard. Now I cannot find the instal disks for my MBP anymore. However I do have a retail copy of snow leopard. The snow leopard shows when on my desktop, when I insert the disk in. However when rebooting and holding the C key it ends up showing the Apple logo then eventually it gives me a message, saying I need to restart my MBP again. I don't know what else to do. All I am trying to do, is give this MBP a clean start, so therefore the new user can use it as if its out of the box for the first time. anyone help?