Apple Multiple Scan 15 AV Display (15-inch CRT) - Manual (Page 27)

What happens after you turn on the energy-saving feature
When Energy Saver is on, the monitor “goes to sleep” after a specified period
of inactivity. The monitor screen looks dark and the monitor is using less
energy. When the monitor is asleep, your computer is still working. But to
prevent accidental changes, you can’t make any changes while the monitor is
asleep.
To “wake up” the monitor, move the mouse or press any key on the keyboard.
Your computer beeps while the monitor is waking up. The process takes
about 20 seconds, and you can begin work as soon as the computer stops
beeping. (The beep volume cannot be adjusted; it is not controlled by the
computer’s sound software.)
IMPORTANT The Energy Saver control panel works with Apple monitors (such
as this one) that comply with the EPA’s Energy Star program and any other
monitor that complies with the Video Electronics Standards Association’s
Display Power Management Standard (VESA DPMS). Your computer model
must also be compatible with Energy Star. Other monitors will darken after
the specified inactivity period, but they won’t go to sleep or save energy.
Using Energy Saver with a screen saver
“Screen saver” programs darken the screen or display a changing image on
the monitor if the computer is not used for prolonged periods. Both screen
saver programs and the Energy Saver feature prevent images from “burning
in” and damaging the screen. Energy Saver also conserves energy.
If you wish, you can use both Energy Saver and a screen saver program. Set
the screen saver to come on before Energy Saver, so if you’re away from the
computer for a short while, you can return to work immediately, without
waiting for the monitor to wake up. If you’re gone for a while longer, however,
the monitor won’t use as much energy.
21 Using the Display Software