Macbook to TV via DVI cable - Only showing desktop wall paper on TV

Please help!
I bought the DVI adapter from Apple, it's the one that fits in the third port from the left on a white macbook 13".
So, on the TV, all that's showing at the moment is my desktop wallpaper... can't get it to show what's on my macbook screen.

Click the "?" at the bottom-right of the "Arrangement" tab in "Displays" system preference.

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