MacBook Pro :: Connecting To Sony Bravia - No Sound

I used to have a White Macbook. This connected to my Sony Bravia via a Mini DVI-DVI, then a DVI-HDMI cable. The sound went from the headphone jack on the MB to two connectors on the TV (L&R). Job done.

Now I have a MBP and am trying the same thing. I have a Mini Displayport-HDMI cable, with the HDMI then going to the TV. I have the same audio connection. The result is perfect picture but no sound at all.

Does anyone have any idea how I can get the sound working? I have the same issue with my unibody Macbook as well. These are the connections I have on the TV;

Connector Type: 2 x HDMI ( 19 pin HDMI Type A ) � 1 x VGA input ( 15 PIN HD D-Sub (HD-15) ) � 1 x S-Video input ( 4 PIN mini-DIN ) � 1 x SPDIF output ( TOS Link ) � 1 x headphones ( mini-phone stereo 3.5 mm ) � Composite video input ( RCA phono ) � Component video input ( RCA phono x 3 ) � 2 x SCART ( 21 PIN SCART ) � 1 x audio line-in ( mini-phone stereo 3.5 mm ) � Audio line-in ( RCA phono x 2 ) � 1 x audio line-out ( RCA phono x 2 )