4200/128 video noise

Hi,
 Wonder if anyone can help me with a problem I get with S-Video In. I get a good picture but there is a line of noise at the top of the picture that I can only describe as video noise(?) It may be data within the video stream, but it's annoying. I've also noticed that it's worse with some sources than other (DVD, STB, etc.) Anyone have any idea what this could be or how to remove it?
Thanks in advance,
Tony

You're correct... thriller is not worth wathcing.

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