Mini Display port HDMI doesn't work? How to fix it it doesn't show neither video nor audio

Hi,
I bought two days ago a Rocketfish mini DisplayPort to HDMI but I still cannot watch anything in my tv. I've tried everything. I plugged the HDMI cable in differents ports of my tv, I plugged it in differents TV of my house but nothing happened. I dont know what the problem is : the TV's, my MacBook Pro or the adapter. I went to system preferences > Displays but the it doesn't recognize the TV and in the other hand the TV doesn't recognize any signal. Help me plase to solve this problem.
Thank you

I dont think is the cable because it works with my playstation 3. Does the size of the tv have any relation to the problem?
No, the size of the TV makes no difference at all.
I would try to exchange the adapter.

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