If I remember you have only one option with the NES which is red-white and yellow (Composite). If that is correct then you need to set your TV to gaming mode. If you are setting it to gaming mode and still having the issue I think it would be your TV. What is the model number of your TV? I would be more than happy to research it for you as you have my curiousity... The majority of all new HDTV's should handle all gaming consoles.
JEFF 
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