Sadly, my refurbished Mac was a lemon. Purchasing delivery and my tech installing went without a hitch. A day later my Mac kept shutting down on its own- I had to restart - we tried everything- Nothing worked - so my advice - KEEP ALL OF YOUR BOXES - Now I have to find a box large enough to ship it in - not to mention spending a Saturday dealing with it all.  My tech said he has never had a problem before with clients buying refurbished- sorry to say - I am not sure I want to go through this again- not to mention the money spent and the time wasted.