System Administration Guide: Basic Administration  Turning Off
Power to All Devices  You need to turn off power to all system
devices when you do the following:  Turn the power off for
system devices, including the CPU, the monitor, and external
devices such as disks, tapes, and printers.  Before you turn off
power to all system devices, you should shut down the system
cleanly, as described in the preceding sections.  ProcedureHow
to Turn Off Power to All Devices    1. Select one of the
following methods to shut down the system:    2. Turn off the
power to all devices after the system is shutdown. If necessary,
also unplug the power cables.    3. After power can be restored,
use the following steps to turn on the system and devices.
1. Plug in the power cables.      2. Turn on the monitor.
3. Turn on disk drives, tape drives, and printers.      4. Turn
on the CPU.        The system is brought to run level 3.