Acer Altos R920 Series - Manual (Page 51)

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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.
1 Remove the front bezel.
2 Press the power button.
3 The system starts up and displays a welcome message on the
monitor. After that, a series of power-on self-test (POST) messages
appear. The POST messages indicate if the system is running well
or not.