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Contrast
(
O
)
and brightness
(
¤
)
controls on the front of the monitor don’t appear
to work.
m For Mac OS–based computers, your monitor may have the contrast (
O
)
and brightness (
¤
) controls disabled. Click the Color button in the
Monitors & Sound control panel and select Preferences. Under Calibration
Protection, make sure that the checkbox to disable contrast and brightness
controls is not marked; then, click OK.
The screen doesn’t dim when Energy Saver or other energy-saving software is on.
m Make sure the energy-saving software is installed properly and the amount
of time you’ve set up to trigger it has passed. For Mac OS–based
computers, see “Conserving Energy” in Chapter 2 for more information.
For Windows-based computers, see the manual that came with your
energy-saving software.
The screen flickers.
m Make sure the monitor cable is connected firmly to the correct port on the
back of the computer.
m The flickering could be caused by interference from a nearby power line
or electrical equipment—for example, a radio, a microwave oven, or
another computer. Try relocating nearby electrical equipment, 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. Make sure you’re using a shielded
ADB connector cable. Move the monitors farther apart or set the monitors
at an angle, so their screens are close and their back panels are farther
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 67 Hz),
the monitor may flicker. You may be able to change the refresh rate for the
card. If possible, use a 75 Hz setting. See the manual that came with your
video card for more information.
69
Tips and Troubleshooting