How to resolve Roku black screen error?

Let us help you to fix Roku black screen error, check the cables used to connect your device to the TV, Power source, and Router. Make sure that the connections are secure. If not remove the cables connected and connect back again. You can purchase new cables to replace the old one. For assistance to fix Roku black screen error, contact our Roku customer support executives 

https://sites.google.com/view/roku-tv-black-screen