Acer AT350 F1 - Manual (Page 36)

2 System setup 24
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 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
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.