How do I format and install fresh OS? I want to do it so I can sell it. I didn't see a disc anywhere in the box unless I lost it. I'm usually good about keeping those sort of things. I see a sealed black thing in the box that looks like it could be a holder for a disc but I don't know. I've turned my house upside down looking for a disc that may or may not exist. My wife got it for me for Christmas 2011 if that has to do with anything.