I have a particular problem I am trying to solve. I will be presenting a keynote in my human resources management class in college. Our classrooms have projectors and computers as well as a variety of pigtails to connect computers (VGA, HDMI are the two video/sound components I have seen available). My issue is the last time I tried to use my mid-2012 cMBP 13 I used a thunderbolt > HDMI adapter and attached it to the HDMI available for the smart classroom. The results were that my videos would not play on the projector and I would get no sound. I had to quickly convert the presentation to powerpoint and use office instead. This time around I would like to get this to work instead. I was thinking about using a remote service from the desktop in the classroom, like logmein...Would this also pull the audio? I don't want the audio to play from my laptop sitting on my desk... I would like to add I also have an iPad Mini with retina display and an iPhone 5 if there is a solution to using one those devices instead. Any thoughts?