Roku Device Features, Settings & Updates

Help configuring Roku device settings, using Roku OS features such as screen mirroring, adjusting display type and audio settings, using Guest Mode, and assistance with software updates.
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Atlasrise
Level 7

Roku Ultra

I purchased a Roku Ultra this afternoon and set it up with my LG tv which is several years old. We watched TV all evening and I attempted to turn the TV off using the new Roku remote. I pressed the power button and the homescreen went away and a white screen appeared with the message "POWER ONLY V3.05.4" floating around. Now, I can't turn my tv off even by using the power button on the side of the set itself. Pushing the power button on the Roku remote does nothing. I have no idea what is going on. HELP!
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