You have been correctly advised regarding the need to supplement
the HDMI to send sound to your Sony Bravia TV. With the addition
of an audio cable to Sound Out on MacBook and a Y-adapter that
converts audio cable to Red/White RCA on the Bravia end you will
have sound. Please allow for a audio couple to connect the Y-adapter
to the audio cable.
The Early 2006 model 1,1 Core Duo has a Mini-DVI port, not a Mini DisplayPort or DVI port.
Depends on what input plug you'll be using on your TV. VGA, DVI, Composite or HDMI. (Composite is the red, white and yellow RCA plugs on your TV or red, white and S-Video plugs.) You'll need a Mini-DVI adapter and a cable from that to your TV. Here's the various types of Mini-DVI adapters on AmazonUK.com http://www.amazon.co.uk/s/ref=nb_sb_noss?url=search-alias%3Daps&field-keywords=m ini-dvi+adapter&x=9&y=11
You'll also need audio cables to the TV using a 3.5mm stereo headphone jack to RCA sound plugs for VGA, DVI or Composite. You attach it from the headphone jack of your MacBook to the appropriate input plugs on your TV http://www.amazon.co.uk/s/ref=nb_sb_ss_c_2_17?url=search-alias%3Dcomputers&field -keywords=3.5mm+audio+cable&sprefix=3.5mm+audio+cable%2Caps%2C565#/ref=nb_sb_nos s?url=search-alias%3Dcomputers&field-keywords=3.5mm+to+rca+audio+cable&rh=n%3A34 0831031%2Ck%3A3.5mm+to+rca+audio+cable
If you connect the MacBook using a Mini-DVI to HDMI adapter you will probably need to use external speakers or a 3.5mm stereo headphone jack to RCA sound plugs connected to a stereo system for audio if your TV doesn't have separate RCA input plugs or a 3.5mm stereo input plug for audio with the HDMI plug. The Mini-DVI to HDMI doesn't carry audio and there're no audio plugs on most TVs to work with HDMI since it's expecting audio with the HDMI.
Ignore my post. Since this is the MacBook forum I didn't read it carefully to see that you have a MacBook Pro.
You might also want to post this in the MacBook Pro forum. https://discussions.apple.com/community/notebooks/macbook_pro Since MacBook Pros have different connections from MacBooks.