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

Roku dims screen

My Roku (whichever model was the top of the line last summer) dims my screen (Panasonic plasma) automatically when it first starts up. 100% repeatable. It is definitely not the TV itself as it never happens with any of the other 3 inputs. Anyone seen this? No answer to 6 emails to Roku support (maybe the worst ever). Thanks for any help.

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