Troubles connecting MacBook to LG TV

I recently bought an LCD TV from LG, model 32LD358 (full HD, 1920x1080, 50 Hz), but i can't connect my macbook (2010).
i bought a minidvi-hdmi adapter and a hdmi-hdmi cable.
if i try using 480p as my tv resolution (which seems to be the only one working), my desktop appears for like 30 seconds then i get 'no signal' message again.
with other resolutions i get no results (no signal).
Any ideas? (i tried every kind of resolution and frequency)
Thanks in advance

Welcome to Apple Discussions!
MacBook 7,1 does not have a mini-DVI port. Either you misidentified the connector on your HDMI to mini, or miraculously managed to get a signal where there was none to be given, or you misidentified the MacBook.
The third port from the left is a mini-DisplayPort:
If that is not what your side looks like, it is not a MacBook 7,1.
Apple menu -> About This Mac -> More Info -> select hardware will identify the Mac in question.
Let's get that clear first.

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