NEC Express 5800/320Lb - Manual (Page 67)

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Power OFF
Follow the steps below to turn off the power. If NEC Express5800/ft series is plugged to a UPS, see
manuals included with the UPS or the application that controls the UPS.
4. Perform a proper shutdown process from Linux for NEC Express5800/ft series.
Press the POWER switch to turn off the power.
5. Power off all peripheral devices.