I am assuming it is the cable anyway, I have 2 Macbook Airs and last night connected the TV to one of them but the screen did not display on the TV, The Mac screen flickered, but the TV screen stayed blank and no external display was found on the Sys Pref. It was the same result with the other Macbook too! The cable did feel hot so I am pretty sure it crapped out. I saw a few Amazon reviews for some of these cables and other people were complaining about the cables dying after a few months. Does anyone know if the official Apple cable is more reliable? I prefer the single cable, and not using an adaptor but HDMI licensing means that Apple can't and never will make a direct cable! shame! I ordered a new cable, so will see how it goes.