IMac to external HDTV

Hi,
I am trying to connect my VIZIO HDTV to my new iMac so that I have some extra screen space. I bought a this cable...
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&ssPageName=STRK:MEWNX:IT&item=3701 40299754
I connected the mini-DVI cable to my iMac and then connected th HDMI cable to the connector and the other end into the HDMI port on my HDTV.
I am getting nothing. Just a blue screen when I change to the HDMI channel where it says "No Signal!"
Can anyone help me resolve this?
Thanks in advance.
Kit

Try opening the display system preference and click the detect displays button.

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