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 Hisense 55 inch TV black screen

My roku TV was working fine last night. This morning I tried to turn it on and the screen is black. If I try REALLY REALLY hard at the screen very very faintly I can see a “Hisense Roku” displayed and then it disappears in literally one second. The red button for power blinks every 20 seconds and I don’t know what to do. Also my tv doesn’t make any sounds...

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