I did this once before so it SHOULD be possible... I attached a cable from my macbook pro to the Sony Bravia TV. It's a six-foot cable with an HDMI connection. There are two icons in the tool bar. The box-with-triangle confirms that mirroring is on, and gives Sony TV and Colour LCD as options - so I assume that the computer detects the TV. The icon next to that one is two arrows in a circle, offering only one option - sync now. When I click on that, the arrows spin but nothing happens. When I open systems pref > display, the offer of AirPlay Mirroring offers a drop-down menu. It's greyed out but it shows "no devices detected." How is it possible that the Sony is showing up in one place but not the other? How can I make the computer screen show up on the TV? Thanks!