This Macbook Air was purchased in early September 2014. When I got it home I transferred everything from my older Macbook Air mid 2011 basically cloning the older one. They are both using the OS 10.9.5. I have refrained from installing Yosemite because of the horrid connection problems so many people seemed to have, because I was already having unexplainable connection problems on the older MacAir. I had spent hours with AppleCare and at Genuis bars trying to resolve it, to no avail. Anyway, when I transferred everything over to this new one I evidently also transferred the random connection problems. I would like to take this new one back to the "fresh from factory" state and then I guess install the latest OSX. The problem is...I don't know how to do that. I also don't know how to then copy my email, documents, pictures, etc from my time machine backups. I'm not very tech savvy AT ALL! Any help for me?