I am really hoping someone can help me with my problem - bearing in mind I am not really very clued up with hardware! Yesterday in my infinite wisdom I decided to reset my MacBook Air to its factory settings (I am in the process of selling it) and after following what I presumed to be straightforward instructions online I went into Disk Utilities to delete a folder (cannot remember which one I deleted). When I went back in to utilities to reinstall the software it shows that there is no disk! I have no idea what I have done, but nothing is working and I am slightly panicked. If someone can please help (or guide me) as to what I should do to try and get my system back up again I would really appreciate it.