Mini displayport HDMI adaptor doesn't work

I bought a mini display port to HDMI adaptor for my Macbook Pro. But every time i plug it into my tv it only shows the default purple sky background and none of my actually stuff. I don't know why it's doing this. can anyone help?

It's working. That's called extended desktop mode. Grab and app on your desktop and drag it off the right side of the screen. It will appear on the other monitor.
You can mirror your displays by pressing CMD F1.
All these settings are in System Preferences > Displays > Arrangement tab
Regards,
Captfred

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^^^
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Thanks CellarDwellr.
I live in Vienna and things are always different here.
We do not have any Apple Store but a company that represents Apple called McShark.
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You're right, but I forgot to mention that the Samsung display is just an LCD monitor, so I don´t really need to get audio output for both connections
Currently, I use an HDMI-to-DVI adapter to connect the Samsung monitor, but I'd like to use the HDMI output to connect my LCD TV instead (and probably a home theater system in the future), and use the Mini DisplayPort output for the monitor, so that I can have a dual-display setup.
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EDIT: David K over at Monoprice customer service has just told me that it will work, however if anyone has experienced this first hand, it would be great.
Message was edited by: austinhab
Message was edited by: austinhab

@Lambstechie - Now that I read into it, if the signal is converted, it can pass over 1 cat6 cable. What I was referring to is a cheaper converter, where an HDMI channel is connected straight to a Cat5/6 channel. And since HDMI 1.3 can work 100% perfect on 16 channels (just no ethernet, audio return, etc.) it seems like 16 channels over two 8-channel Cat5e/6 cables seems fit.
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@Eww - I see where you are coming from, and I did not see the price of those cables until now. That seems like a great deal. Thank you.
Message was edited by: austinhab

Mini displayport HDMI adaptor doesn't work

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