I have a second-hand MacBook Pro that I've owned for a couple months now and I am trying to sell it. The previous owner had Lion installed on it. I would like to reformat the computer, but I'm not sure how, as there is no physical media for OSX Lion. I only have the CD's from the original box. So I am wondering how to go about reformatting the computer and retaining OSX Lion. I am kind of a Mac newb as well. Thank you.