Wii video is black and white
Possibly you've plugged the video into the component (RGB) portion of the input - this calls for 3 connectors (Red, Blue, & Green) and if you only plug one in from a composite it comes out grayscale. If you only have one video lead (yellow connector) make sure it is going to a composite connection which should also be yellow. Otherwise, more info is needed about your connections.
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