Hd 4200 / TV LCD - not detected

Hello,
Hy. I'm from Brazil and haven't sucess to conect my PC (via hdmi) on my TV LCD (LG 32lg30r). The Tv shows a message "no sinal".

I'm using a motherboard asus m4a785-m (hd4200), athlon X4 620 e OS windows 7 (32bits).

When I open the catalyst 10.3 the option to detect displays doesn't work. In the desktop the option in properties to detect tv not work too.

I ready something about an option in catalyst that must to be zero. What is this option?

I think that is a problem of resolution. My TV seems to have 1366x768 and I dont know if hd4200 have this option.

In HDMI the TV recognize 720x480; 720x576; 1280x720; 1920x1080i and 1920x1980p.

Should be easy in windows 7, cause someone tell me that it will give the options video 1 e 2 when I start the PC, but this thing doesn't works.

Someone could help me? I'm very very lost.
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  1. Have you tried the option to force TV detection?

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