Thunderbolt to HDMI adapter not working

I just purchased a 13 inch macbook air and when I use my thunderbolt to hdmi adapter my Samsung monitor along with my other displays do not recognize my mac.  How can I get my monitors/displays to recognize my device?  Do I need software to get this working?
I am using an amazon high speed hdmi cable with ethernet.  Will that effect my connection?

I finally learned how to get "Detect Displays" to show up. You have to press the Option key while in the Display pane.
Unfotrtunately this does not work. No other displays are detected. Yes, the TV is on and plugged in to my computer.

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