Need help hooking up HDTV to iMac using Thunderbolt/HDMI on OS Lion

I have been trying to figure out why my HDMI television gives me a "No signal" message when I hook it up to my iMac. It is the 2.5GHz Intel Core i5, running OS X, version 10.7.5.
How do I hook this up? I just bought a new TV and the one I had before this, I used to just hook the HDMI cable in from the Thunderbolt port to the HDMI port on the back of the TV and it would immediately just come on. Now I get a "No signal" message when I do it. Is there a setting somewhere I'm missing?
Thanks.

Do you have another adapter / cable to test with?
what about another port on the TV?
What about trying the old tv?
you could check the display settings:
apple menu
system preferences
show all
displays
arrangement tab (arrangement tab only shows up when the mac detects a 2nd display. )
gather windows

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Need help hooking up HDTV to iMac using Thunderbolt/HDMI on OS Lion

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