Find the Power key on the keyboard, most likely in the upper-right corner.
Press and hold the Power key for about two seconds until the screen goes dark.
Press the Power key again to boot up the Chromebook.
Click the notification panel to display the quick settings menu in the lower-right corner of the screen.
If an update is available and downloaded, you'll see a button that says Restart to Update. Select this button.
Wait for the Chromebook to shut down and power back up.
Press and hold the Power key until the Chromebook shuts down.
Locate the Refresh key. It looks like a circular arrow and should appear in the top row of the device's keyboard, next to the back and forward arrow keys.
Simultaneously press and hold the Refresh key and Power button. When the Chromebook starts, release the Refresh key.