Make sure your component input is set for component and not RGB(computer)
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i agree with rwwear--the setting on your display is most likely set to rgb (or to interlaced) rather than component (or to progressive)--use your tv remote to correct. you can try running the component out on your cable box directly to the display to see if in fact this is the case. my question is why not use the hdmi output on your receiver (or, if doesn't have one, run hdmi directly from cable box to display. you'll most likely get a better picture than through the component out.