Why cannot I no longer connect my Macbook (not air og pro) to the TV?

I have a Macbook (medio 2010) which I can no longer connect to my TV. I have the two connected with a DVI to HDMI and in the beginning I had no problem using this - it all happened automatically.
Now it just says I need to check the connection and in settings I can no longer choose en external display/mirroring.
I have updated my software to Mountain Lion 10.8.3 and the weird thing is I got it to work one time the other day. When I connect the two the screen on the computer turns burn (it reacts), but nothing is transmitted to the TV.
What can I do?
I have tried connecting the cables in different sequences, turning mac/TV off and back on, updated software, but nothing seems to help. I am desperate - please someone help me.

Have you checked the Sound Preferences under the System Preferences and set it to USB speaker for the sound output? Sometimes it can change on its own or after and update of an App or the OS?

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