No color display on external video output using S-video to TV

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I can't get my laptop to display color when i try to do a external
display to my TV using S-video cable to RCA of the TV. My laptop (compaq
presario) have a 7pin S-video jack but i'm using a 4pin s-video cable . Is
this the problem why i get no color display on TV? I heard that the 7 pins
cable are mostly used for dell computer , and i have problem getting one in
most of the video shops here,as they only have 4pin type.

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