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What should you do if the Cornerstone Screen freezes, fives you a white screen, or a black screen?
Press the C on the bottom right hand corner to open the keyboard. On the top left of the keyboard there is an Up-Arrow to press which gives you a "reset" button. If you have a physical keyboard, Alt+F4 will reset as well. If this still doesn't work, call Jordan or an electrician to reset remotely.