Acer Altos MU.R230E.001 - Manual (Page 43)

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Turning off the system
There are two ways to turn off the server—via software or via
hardware. The software procedure below applies to a system running
on a Windows OS. For other NOS shutdown procedures, refer to the
related user documentation.
To turn off the system via software:
1 Press Ctrl+Alt+Delete on the attached keyboard or click the Start
on the Windows taskbar.
2 Select Shut Down.
3 Select Shut down from the drop-down menu, then click OK.
To turn off the system via hardware:
If you cannot shut down the server via software, press the power
button for at least four seconds. Quickly pressing the button may put
the server in a Suspend mode only.