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

Unsupported signal error message

While watching shows on our Roku device the screen started flashing black. Went to hit the back button to determine if it was that streaming service or something else and then received the error message “Unsupported signal. Please check device output” from my TV. Have changed HDMI Ports and power sources several times with no change. Is this a problem with the Roku device?