Solving playback issues

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 8

Immediate black screen Sharp TV Roku stick

The screen is black when I switch to the Roku input.  When I unplug and replug it in, I see the purple Roku briefly and then it goes black again.  Nothing I do on the remote makes a difference; unplugging and replugging into the TV doesn’t help.  How do I fix it when I can’t see the screen to do anything?  The Roku is only a year old so it shouldn’t have failed already.

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