When using hdmi to tv, sound is not transmitted. Pls help

When I use the hdmi port to hook to tv no sound is transmitted.  It was working a few days ago now its not.  I tried to reinstall drivers as well as changing tv's and 2 different new hdmi cables.  Anyone have any clues? 
C855D-S5320

Your turn to do research, Brad. Please let us know what you learn.
   hdmi "device is being used by another application"
-Jerry

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