Hi Everyone

I just got a Samsung 51" Plazma (51" Plasma 720p TV - 600Hz - Clear Image Panel | Samsung PN51F4500AF) and a Visio Sound Bar (VIZIO High Definition Soundbar | VIZIO) and the only Audio output from the TV is a Digital Audio Out (optical).

So, I connected the TV to the Sound Bar with a digital optical cable, and the Sound Bar works great when I am watching TV.

However, when I put a USB thumb drive into the TV, change the source on the TV, from coaxial to USB and try to play a movie, I get no sound to the Sound Bar. I only get sound from the TV speakers.

How do I get sound to the Sound Bar when I am using the TV's USB source???