"Check your signal cable" on a Samsung LN32B450

I just buy a Samsung LN32B450, and when I connect it to my computer appears this message: "Check your signal cable". I can see my desktop and everything that displays my computer, but I can't get rid off that message. Any solution is really appreciate. Thanks
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More about check signal cable samsung ln32b450
  1. I am having the same problem and Samsung services here are not so worthy helping...

    It would be highly appreciated if you could suggest me the solution which worked for you in the end.

    I need this thing working perfectly for urgent reasons.
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