I am getting a headache trying to figure this out. The previous owner deleted all his drives including LionOS (I know it is Lion because it still gives me the option to "reinstall Lion" but I can not do this since it is currently "unavailable from the apple store"). I was wondering if this was because I have not bought lion http://www.apple.com/shop/product/D6106Z/A/os-x-lion from my account on the app store yet? I would eternally grateful if someone could help me with this and give me some options. Is it possible for my to just install windows or linux on it from a USB drive just incase?