Turning Your Chromebook Off; Using Chromebook; Using The Power Button On Your Chromebook - Asus Chromebook C523NA Manual

Turning your Chromebook off

You can turn off your Chromebook by doing either of the following
procedures:

Using Chromebook

1. Launch the status area.
2. Click/Tap

Using the power button on your Chromebook

You can also use this option to turn off your Chromebook in case it
becomes unresponsive.
IMPORTANT! Save your files before performing this option to prevent loss
of important data.
To do this, press the power button on your Chromebook for at least four
(4) seconds until your Chromebook turns off.
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Chromebook E-Manual