Acer Altos MU.R230E.001 - Manual (Page 39)

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Turning on the system
After making sure that you have properly set up the system, applied
power, and connected all the necessary peripherals, you can now
power on the system. Follow the procedure below.
1 Open the bezel door.
2 Press the power button.
The system starts up and displays a welcome message on the
monitor.
After that, a series of power-on self-test (POST) messages
appears. The POST messages indicate if the system is running well
or not.