How To Get Sound To Play Out From MBP Onto HDTV?

I hooked up my MBP to my HDTV last night using the DVI - HDMI cable and had no issues with picture.
This is the model of HDTV I have: http://www.hitachidigitalmedia.com/product_techspec.do?pt=17&pg=69&proid=593
I then connected plugged in a phono L+R to 3.5mm Jack Audio Cable from the headphone port on my Mac to the PC Audio Input on the TV. Nada sound.
Then tried connecting to the Audio Input points on the TV. Still nothing.
The only Audio sockets my HDTV has are:
Audio Input •
PC Audio Input •
Audio Line Out •
Headphone Socket •
Component Audio
so don't think I can use TOSLINK either.
Can anyone help? Spent last night with picture off the HDTV but sound off a set of external Creative speakers hooked up to the MBP.
Thank You,
Arivind Abraham

I think that the audio cable from the MBP to the audio inputs on the TV would have worked if you had gone to System Preferences -> Sound -> Output and assigned the output there. YMMV

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