Apple Power Macintosh 8500/150 Series - Manual (Page 23)

Trouble? If a problem with the computer prevents you from using the Power
key on the keyboard or choosing Shut Down—for example, if the computer
“freezes” so that the pointer does not respond to the mouse—you can turn off
the computer by pressing the power button on the front of the computer. Use
this method only if you cannot choose Shut Down or Restart (when you press
the Power key on the keyboard, or when you open the Special menu).
IMPORTANT You could lose unsaved work if you use the power button on the
front of the computer to turn off your computer. Only use the power button
when there is a problem that prevents the computer from being turned off
with the Power key on the keyboard or the Shut Down command. To make
sure your work is saved, use the Power key on the keyboard or the Shut Down
command.
To turn the computer on again, just press the Power key on the keyboard.
23 Getting Started