I am watching a TV show and I get video but no audio. I'm using HDMI output to my TV monitor. It worked yesterday just fine

I downloaded a TV show and am unable to get audio from my pc to the TV monitor using HDMI output. It worked fine yesterday with the same tv show download. Video/Audio is ok to my pc and video is getting to tv monitor. Everything is the same but, can't find the audio. This is my first time doing a iTunes download so any help is appreciated by this rookie.