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If all devices on every input appear in B&W and you have reset the picture settings in the menu, then the color processor is shot. If you can get color on all but that device, its either the device or the cable.
If you are connected to a HD cale box using component cables IE (G, R & B) then check if either the Red or the Blue has come loose or unplugged as this will cause most HD sets to revert to a black and white picture.
Have you tried to hook up a DVD player or any other source? If so does the color come back? If not then I recommend you call for warranty service if the set is in warranty, sounds like the vidoe processors are bad on the main board