Connections to get Audio to HDTV

I've just connected a mini display port/HDMI cable adapter to my imac, I'm getting Video display but no sound.
I'm not going to bother trying any other adapters, so just wondering how I would go about getting the audio to the TV. Could I use a USB to RCA cable for this?
Cheers
Message was edited by: Eoin Rice

I got the same problem, I purchased iMac beginning this year, I want to watch movie in my LG tv instead of the iMac, so I purchased a mini DP to HDMI converter via ebay then connect to HDMI to HDMI cable to my TV.
First time I plug in, Video and Audio went through. I can watch happily in my TV, output setting in iMac set to LG TV. Then something happen, the next day I want to watch another movie, in output setting there is no LG TV anymore, eventhough I've tried to reconnect everything including restarting them. I cant pass through the audio anymore to the TV. I tried to plug headphone jack - RCA cable to the TV, but still audio not coming in if I stay on HDMI section.
Anybody can help me out? Thanks guyz

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