HDMI cable supporting sound

Hi there,
I bought a single HDMI cable from my macbook pro to my TV. The cable said to support sound and image, yet when I connect it, the sound still plays through my macbook.
Any idea how to fix this, or do I actually need to buy an extra cable because my macbook can't handle this cable?

To update:
There is no "HDMI" option I can select in my Sound settings in System Preferances.
There also is no option on my Panasonic TV that allows me to adjust the sound to any HDMI cable.

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    Message was edited by: bevmex

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    ****Click the White thumb to say thanks****
    ****Please mark Accept As Solution if it solves your problem****
    ****I don't work for HP****
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