I have had my Macbook Air for nearly a year now. I have never had a Mac before but have enjoyed it. I cannot get my keyboard to work anymore. I have read up and rebooted it, have tried it in safe mode but am too frightened to mess around with safe mode. I want to get it back to factory settings......But I can't get my head round how to do it. I am typing this on my Nexus.....Can someone help me, I need it in real simple terms.....PS I am in my sixties..Not Mac Book savvy!