Problems connecting my macbook pro to my samsung led Tv

Hi. I try to present some pictures and videos by connecting my macbook pro to my samsung led Tv but my mac doesn't recognize the Tv (or it could be that my TV doesn't recognize the mac). What should I do?

I have problems too with some projectors and the DVI--VGA adapter that came with my MBP. The projector is recognized by the computer, but does not show any signal.
With the help of Stéphane Madrau, who has written the excellent tool SwitchResX, I found out that the projector reports that it takes digital input when I connect the MacBook Pro, but analog when I connect it to my 12" PBG4. From the DDC information (collected with SwitchResX):
MacBook Pro, DVI--VGA:
Input signal & sync:
Digital
PBG4, miniDVI--VGA:
Input signal & sync:
Analog input with: 0.700V / 0.300V
Separate Sync
Composite Sync
Given that the VGA cable is analog only, I would think that the MBP tries (or rather, does) output digital signals only, which don't make it into the VGA cable. If I find a solution I will post it here.
The clue was that the computer did not report any vertical scan frequencies for the external display, while it did so for a projector that worked.

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