I am trying to use my 2013 air(OSX 10.9.1) with a mid 2010 27' iMac (3.2 ghz intel, OSX 10.7.5) as display. I bought a mini display port to mini display port cable. When I hit cmd F2, I see the background of the MBA desk top appear and the info bar at the top. I can't see my mouse or any active windows from the MBA or my dock. Any thoughts on why I can't get full functionality?