Most digital cameras come with a special cable for connecting the camera to a television set.

Make sure that you are connecting it correctly at the television end.
You may be connecting to one of the Red/Blue/Green Component inputs instead of the Video input (which is usually color coded yellow).

If you only get black and white, try it on a different television set so that you can determine if the problem is with the camera or the television.

If you determine it is a camera problem, it is time to phone Canon and get the camera repaired under the warranty.