Hi everybody. I'm a new Mac-er. I need help to re-install Lion on my new MacBook Air. I've researched so mush before creating this thread. So I hope that someone can help me to resolve my problem. And here it is: I used RecoveryHD to re-install Lion but the system displayed a report like this: "This version of Mac OS X 10.7 cannot be installed on this computer." Thank you for all of your ideas.