Ken.....you need to first make sure the Digital Optical cable is connected to the Bose unit and the TV. The cable (ends) looks like the one below.
On mine, once I turn on the TV, I turn on the Bose unit, using the Bose remote. The Bose remote has several SOURCE inputs. Try each of them, giving them a few seconds, and see if you get your sound to work. The Bose remote also has a volume button, so make sure it's turned up.