I would be calling my dealer and or Redwood if the optical cable was not with the unit upon delivery, and being the way I work, I would make them hook it up and make sure it works as that is part of the warranty. Lazydays (Tampa) installed my satelite and made sure all TVs worked, including the home theater stuff, when we inspected and received our unit. When we cleaned our unit after a long trip, I inadvertedly reversed the cables when I replaced the unit back into the cabinet (a senior moment!!). We have a LG home theater system. Just my opinion.