Apple Macintosh LC 580 - Manual (Page 21)

You can also shut down your computer from the keyboard:
1 Press the Power key (marked with the triangle) on the keyboard.
You will see a message asking whether you want to shut down or continue
working.
2 Click Shut Down.
Turning the computer on
To turn on the computer after you’ve shut it down with either the menu
command or the keyboard:
m
Press the Power key (marked with the triangle) on the keyboard.
Leave the power switch on the back of your computer in the “on” position
(with the top part of the switch, marked with the symbol i, pressed in).
13 Getting Started