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My Xbox hard drive recovery procedure is turning out to be a real pain. After finding a suitable linux script and formatting a new 500 G hard drive i finally completed the three stage offline update procedure to be greeted with a new 2018 dash board. Some remnants from my previous settings and games were still present so I decided to clear out the games and redo a fresh installation. Now the system goes to a black screen. If I press the controller xbox button it displays a menu page with options to Shut down the console or the controller and two menu buttons one for the magnifier and the other narrator. I cant figure out how to go back to the main menu. Any suggestions.

Not sure because you didn’t send a picture with the question but it sounds like you accidentally triggered accessibility settings. Refer to below article to turn it off. https://support.xbox.com/en-US/xbox-one/