Apple PowerBook (2400c) - Manual (Page 21)

Putting the computer to sleep
Sleep is a power conservation feature of Macintosh PowerBook computers
that lets you instantly restart the computer and bypass the startup process.
You can extend the period of time your battery will power the computer by
putting the PowerBook to sleep when you won’t be using it for several
minutes or hours. The length of time the computer can be left in sleep
depends on the charge state of the battery.
To put the computer to sleep, follow these steps:
1 Press and hold the Power key for about two seconds.
2 Click the Sleep button.
Other ways of putting your computer to sleep
m You can choose the Sleep command from the Special menu to put your
computer to sleep.
WARNING Once you put your computer to sleep, listen for the hard disk
to stop spinning before you move your Macintosh PowerBook. Moving
your Macintosh PowerBook with the hard disk spinning can damage
your computer.
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