IMac 2011 Thunderbolt - iWires MDP to HDMI

Hello all - I've had a good trawl through the communities and am unable to find a fix for my issue.
I've recently upgraded from a 2010 mac mini, with HDMI to a new iMac 2011 - which has the new thunderbolt port.
By my understanding, this will enable me to use the Thunderbolt Port - identical to the old Mini Display Port to output HDMI to my HDTV.
I've bought a MDP to HDMI adapter (http://store.apple.com/uk/product/H2774ZM/A/Mini-DisplayPort-to-HDMI-Cable-2m)
But my mac will not recognise my TV, no matter which way method I use.... ie turning tv off and then plugging in to the mac..
Do I have a dodgy lead / dodgy mac, or both!?
My intention is to swap the lead at the apple store - and see what happens... but in the meantime, I thought I'd pick your brains!
Cheers,
Tom

Fixed.... turned both the tv and the imac off and on a few times.. eventually worked and is fine now.  I can also confirm that the sound does work perfectly!
Tom

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