Connecting Macbook Pro 15" to Samsung HDTV - Audio Problem

Hey guys,
I'm new to these forums so I hope i'm posting this in the correct section! On to my problem...I have a MacBook Pro 15" 2.8 GHz- Late 2009 (model: MB986LL/A) and I'm currently trying to connect it to my new TV which is a Samsung LCD HDTV (model: LN46C610).
The video connection is perfect. I'm using Apple's Mini-DisplayPort to DVI, via DVI to HDMI to my TV.
The audio connection for some reason is not working.
I've tired using an RCA cable, which has a regular audio jack on one end, and the 2 coloured wires (yellow + red) at the other end. No luck.
Now I was told to buy a Mini-Toslink cable to connect from my TV to my MBP. I've plugged the Optical Cable into the TV and the other end to my MBP. Yet I still have no sound.
Can anyone please guide me on how to set this up? Maybe i'm doing something wrong or i'm using the wrong cable. Any help would be greatly appreciated!
Thanks!
Karman

Ok i'm in the Utility but i'm confused...where would I go to select it to change the output?
Because everywhere i've tried...I don't see an option to change it...
*EDIT: ok I've noticed when I plug in the mini-toslink cable to my MBP, i notice the output source changes from Internal Speakers to Digital Output*
*EDIT #2: Still no sound when I do that...also on the back of my TV, the digital output connection use to have a red light in it, and now it doesn't anymore?*
null

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