Please help with video card problem,pc to tv probs,cant get videos to play on tv just windows animated?

i have my tv hooked to my pc via s cable, i see everything as same as monitor but my videos will not play. have tried several media players but none worked. whats weird is my space video works fine.|||Check your connections.

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If the videos will play on your computer with your usual monitor, but not with the TV as monitor it is probably a codec or format problem.

What kind of error message do you get?