Apple Power Macintosh 8600 - Manual (Page 11)

By the way: Depending on the type of monitor you have, you may only need
to turn it on once. Some monitors will turn off automatically when you shut
down the computer and turn on automatically when you start up the
computer. With other monitor types, you may have to turn the monitor on or
off separately.
2 Turn on your computer by pressing the Power key.
The Power key is marked with a triangle on your keyboard.
You should hear a tone from the computer as it starts up. If you don’t, press
the Power key again, and hold down the key a little longer this time.
3 Check to see what’s on your screen.
You’ll see a sequence of messages describing what is happening, followed by
the Energy Saver dialog box. (If your computer does not start up properly, see
“Problems Turning Your Computer On,” next.)
11 Setting Up Your Computer