Dell P2722HE 27" 16:9 USB Type-C IPS Monitor - Manual (Page 40)

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Setting up the monitor
• When the monitor and the PC power state are both ON, press and hold the
monitor power button for 4 seconds , the screen prompt will ask if you
would like to shut down the PC.
• When the monitor and the PC power state are both ON, press and hold the
monitor power button for 10 seconds , the PC will shut down.