my rc mini helicopter's tail rotor wont spin?

Start with the obvious,are the linkages connected?
If you think its a radio problem change out the servo with one you know works.
Is the main rotor working?
Go to http://www.rchelicopters.com
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Is the tail motor working and are the wires properly connected?
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make sure the wires are not broken, if they aren't then the tail motor just burned oout.

sorry
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Cool, I just found it at http://smarterdeals.info/441047/mini-helicopters
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http://smarterdeals.info/441047/mini-helicopters

check it below. http://yourselect.info/441086/mini-rc-helicopter
References :
http://yourselect.info/441086/mini-rc-helicopter