i have my shaw cable box hooked up with an hdmi cable to my sony tv and sound works fine over tv speakers. I just bought a polk audio sound bar and hooked it up to my tv's audio out with an optic cable. My Ps3, xbox, and computer all work with the sound bar fine after setting tv audio to play though its out port. 2 are hooked up with just hdmi cables one is a component. My shaw box does not work at all and i have tried all the settings in the menu for the cable box. any ideas why it wont work?