I have connected the adapter and cable from imac to GVA HD tv but nothing seems to be happening.

I have connected the adapter and cable from imac to GVA HD tv but nothing seems to be happening. Any suggestions?

Was that message showing a s dialog when selecting the tv connection as a sound output device?  I ask because I don't know the exact context of that message and never heard of it before.
It may be helpful to take a screen shot of both that message and also the list of the sound output devices while the tv is connected.
You never specified your model (year) of your imac so I don't know its limitations.  Maybe some version doesn't support sound through the mini-displayport (hard to believe any model wouldn't with mini-displayport).  But if that is the case you may have to resort to analog stereo from you stereo line out output jack to your tv.
One final thing.  The mini-displayport adapter you have may not support audio.  That was a possibility a few years ago.  That is why most places that sells these things also explicity specify whether the adapter supports audio.  For example, monoprice's adapter:
Mini DisplayPort | Thunderbolt® to HDMI® Adapter w/ Audio Support
or even the Moshi adapter sold through the apple store.
Moshi Mini DP to HDMI Adapter with Audio Support
Note both these adapters explictily say they have audio support.

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