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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Level 7

Screen keeps flashing black to normal every few seconds

I hooked up my xbox to my haier roku 43 inch. When I unplugged my xbox from the tv the screen went dim and now it starts blinking black every few seconds constantly it dont stop. I've tried 2 new hdmi cables, reset settings , reset tv, idk what else to do

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