I decided to use my Sony TV as a video/audio display linked to my new MBP and so I have bought an adaptor to connect to my MBP Mini Display Port with the outlet being HDMI, thinking that I would just have to connect this to an HDMI socket on my TV with an extension cable. There is a spare HDMI socket on the TV, originally intended for a DVD player but when I plug in the PC extension cable nothing happens. There is a VGA socket meant for a PC, but I chose to go for the better quality of HDMI. thinking I could connect to any HDMI . Have I boobed or is it possible to get the TV working as an additional display using HDMI.