Am not able to get Video on my new LCD tv?

I can access dvd and cable box in Samgung LE37r74bdx) Tv.
In the sourcebutton on the remote I have EXT 1 and EXT 2. The latter one is supposed to have the Video. But it says NO Signal Anyone know what I am talking about..
What do I do?
thanks

Answer:
Check your cables to make sure that audio and video are not reversed. I know what you're talking about, but have only seen this when things aren't hooked up properly.
Samsungs are sensitive to the plug being PLUGGED IN.If it's barely connected it won't sense the Video connection. Push all connectors on until they are seated

If that's not the problem, try swapping the cables between Video 1 and Video 2..IF 2 is still not sensing the signal then it's time to get the TV to a repair shop..

Could be as simple as soldering a connector...
check you are using the correct scart cable,they are wired differently.also check tv menu that you are switched to the right ext.

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