How to connect imac to tv using thunderbolt to hdmi cable

I'm trying to connect my mid 2011 iMac to my tv. I have a thunderbolt to hdmi cable that I purchased. I connected the thunderbolt port to the iMac and connected the hdmi port to the tv. I turned on both devices and the tv is not getting the signal. What am I doing wrong? Any help would be greatly appreciated!

If you open the Displays preferences and do not see an Arrangement tab (or there is an Arrangement tab that shows only a single monitor) then there is something physically wrong with your connection.
Although I don't have thunderbolt, since you can plug mini-displayport into a TB socket, then like mini-displayport, they a a little sneaky in that you need to make sure the plug is fully seated in the socket.
If you do have an Arrangement tab, and it shows two screens, then click detect displays.  Then click Gather Windows to bring the TV's Displays preferences on to your main screen.  Set the proper resolution (probably 720p, 1080i, or 1080p).  Set the refresh rate (probably 60Hz).  You should see a picture at this point.
You may have to play the underscan/overscan settings on your TV and the displays prefs for the TV if the picture is too small or larger for the TV screen.
Also, you need to set your Sound preferences to output to the HDMI connection.

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