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Selecting chrombox input produces a black screen with a spinning wheel in the center.
Wake up the chromebox by touching the display screen. or touching a key on the wireless keyboard.
Check the chromebox for a light on the power button of the chromebox
if it is off, push the button to turn the chromebox.
If it is on, push ant hold the powerbutton until the light goes off, then push again to restart.
If chromebox was signed in by another user and it is on the lock screen.
If you cannot have the other user sign out, locate and press the sign-out button on the lower left corner of the panel while viewing the chromebox.
The AppleTV will have a similar name to the display. (i.e. SCHO-ATV-RM#)
Use the AppleTV remote to
Wake the AppleTV from sleep
Turn the AppleTV on
Check the name of the apple TV in the Settings app.