Apple Multiple Scan 17 Display - Manual (Page 36)

m Increase the brightness of the picture. See “Adjusting the Brightness of the
Picture” in Chapter 3.
m The Energy Saver option may be activated. Move the mouse or press any
key on the keyboard to reactivate the monitor. In approximately 20 seconds
(or until you no longer hear the beep), the monitor is reactivated.
m A screen saver that darkens your screen may be activated. Move the mouse
or press any key on the keyboard to reactive the monitor.
The screen flickers.
m Make sure the monitor cable is connected firmly to the correct port on the
back of the computer.
If you have a video card installed in your computer, the monitor cable should
be plugged into the port for the video card.
If you do not have a video card installed in your computer, the monitor cable
should be plugged into the monitor port on the back of your computer.
m The flickering could be caused by interference from a nearby power line
or electrical device—for example, a radio, a microwave oven, or another
computer. Try relocating nearby electrical devices, or moving your
computer and monitor.
m If you have more than one monitor attached to your computer, the monitors
might be interfering with one another. Move the monitors farther apart or
set the monitors at an angle, so their screens are close and their back
panels are father apart. If after moving the monitors more than 16 inches
apart, you still see flickering, contact an Apple-authorized dealer or service
provider.
m If you are using a video card that has a very low refresh rate (below 60
Hz), the monitor may flicker. You may be able to change the refresh rate
for the card. See the manual that came with your video card for more
information.
No colors appear on the screen.
m Check to make sure that the number of colors is set correctly in the
Monitors control panel. See the manuals that came with your computer for
more information.
30 Chapter 4