After downloading Mavericks, my built-in camera doesn't work.  Somewhere on the Apple website I saw a list of macbooks that Mavericks' features work on, and mine is not one of those - I really wish it had said that before I installed it.  I did not think to back up OS X Mountain Lion on Time Machine (I haven't been able to set it up) and when I took my macbook to Mac Authority, they didn't know what to do and sujested I look on youtube.  I have found nothing to help, and I really would just like to reinstall Mountain Lion (even if that means buying it again), but it is no longer available on the App Store.


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