The Macintosh II, Macintosh IIx, and Macintosh IIfx computers do not have
a "hard" power on and power off switch. There are two ways to turn on the
computer: you can use the keyboard's Power On key or the power button next
to the sound jack on the back panel of the computer.
Pushing the Power On key or the power button sends a request to the logic
board to begin the startup sequence. Either way may be used; they are
equivalent.
To power off the Macintosh II, IIx or IIfx, use the Shut Down command from
the Finder. Choosing Shut Down permits the computer to close files that
are open, update the directory on each disk, and power off the system.
Alternatively, you may press the power button on the back panel of the
Macintosh. Doing so will power off the system immediately and any work
that wasn't saved will be lost. Do not remove AC power from the system
unless neither Shut Down nor the power button produce results. Removing
power is likely to result in lost or damaged files because there isn't
enough time for the computer to update disk information.
To restart the computer with a different boot disk or to cause the
computer to recognize newly installed devices, you may wish to reboot the
Macintosh by choosing Restart from the Special Finder menu. The Macintosh
will save file information as needed, power off the system, and
immediately startup the system again.