Suddenly I can't connect my macbook to my TV

Hello:
Hope somebody can help me with this.
I have my new macbook connected to a LCD TV through a mini-DV to DV converter and to the HDMI connection of the TV. I have had this kind of connection with a two years old macbook and didn't had any problems. The new laptop worked perfectly with the same connection for about a week, but suddenly is not working. If I connect the miniDV to the macbook, both screens start to blink like if they were trying to adjust their resolution. It's so weird. If I don't turn on the TV I can manipulate from the macbook's display preferences the resolution, refreshing and mirroring of the TV, but none of the options work: if I turn the Tv on both screens start blinking again.
Thanks in advance and apologizes for my disastrous English,
Best regards,
Berta

I just discovered that I have a similar problem. I've been having no problem at all connecting my old MacBook to my Samsung HDTV. This week, I got my new aluminium MacBook, with a Mini DisplayPort VGA Adaptor, and the TV won't recognize that a computer is plugged-in. The MacBook sees it and recognizes it as a Samsung display, but I can't get it to work. My old MacBook is still working but it still has 10.5.4 on it (Thank God!). Now, I don't know if the problem is with the computer or the version of OSX, but I'm certainly not upgrading to 10.5.5 on my old MacBook until this is resolved...

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Suddenly I can't connect my macbook to my TV

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