Playback Issues - Audio/Video & Power

Help with audio & video playback issues, TV display type recognition & compatibility, HDCP messages, troubleshooting playback errors, advertisements, and resolving power issues.
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Level 7

No sound within apps

My Hitachi tv with built in Roku is having audio issues. Once I choose the app I’d like to steam and the show I want to watch there is no sound. I’ve unpluggged my tv twice waited 5 minutes and tried again and at a glance my HDMI cord is absolutely fine.  Can someone please help me? 

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