A general case might be to take the stereo headphone output of the laptop and feed it a set of left and right line level (not microphone level) inputs to the soundboard. Radio Shack sells a cable that has a typical mini stereo headphone plug on one end and a pair of RCA Phono plugs on the other end. If the soundboard does not have phono jack inputs you will need some type of adapter plug on the ends of the cable phono plugs to match the soundboard's connector.
You then experiment with the laptop's volume control setting (start low) and the soundboard's input level control to get undistorted sound with minimum noise and hum. If you can not get rid of the hum, you probably need to add a ground loop isolation box (also available from Radio Shack, I believe) to reduce or eliminate the hum.
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