Mini Displayport to HDMI doesn't work!

Hi 2 all!
I bought a Mini Displayport to HDMI cable (Manufacturer Artwizz) a few weeks ago and last week I have received the new Macbook Pro 13''.
I tried to connect the Macbook with my LCD TV and Beamer through this cable but both didn't work! After having connected the cable, there was just a blue screen for one second on the macbook, and the TV/Beamer just recognized that I have put in a HDMI cable. But there has nothing been transferred to the TV screen.
Do I have to change anything in the settings on my Macbook or what can I do that the connection works?
Thanks, Dario

Then unless there's some newer/different setup in 2011 13" MBP (if so, I'd look in Displays), it sounds like a hardware issue, either with the cable or the MBP.
I would contact AppleCare, as you are still in your three month free phone support, and one year hardware warranty.

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