Troubleshooting 91
m Calibrate the monitor.
m In Mac OS X, choose System Preferences from the Apple (K) menu, click Display,
select Color, and click Calibrate.
m In Mac OS 9, choose Control Panels from the Apple (K) menu, then choose Monitors
from the submenu and click Calibrate. The Calibrate option is not available on some
displays.
m The flickering may be caused by interference from a nearby power line, a fluorescent light,
or an electrical device—for example, a radio, a microwave oven, or another computer. Try
relocating nearby electrical devices or moving your computer and display.
No colors appear on the screen or the colors don’t look right.
m Make sure the display is connected firmly to the computer.
m Calibrate your monitor, as described previously. For more information on color and your
display, see Mac Help.
m Use the Display pane of System Preferences (in Mac OS X) or use the Monitors control
panel (in Mac OS 9) and make sure your monitor is set to display colors. For more
information on color and your display, see Mac Help.
After you change the screen resolution, desktop icons move.
m Changing the screen resolution affects the display of information on your screen.
The operating system may reposition icons after you change the screen resolution.
The screen freezes.
m Force the application that has frozen to quit.
m In Mac OS X, choose Force Quit from the Apple (K) menu and select the application.
m In Mac OS 9, hold down the Esc, Option, and Command (x) keys and click Force Quit
in the dialog box.
m If that doesn’t work, force the computer to restart by pressing the reset button (P) on
the front of your computer.
The light on the front of the monitor is flashing.
On some Apple flat panel displays, the power light displays a series of short flashes when an
error has been detected.
m If you see a repeating sequence of three short flashes, the monitor is detecting input in
the wrong video format. Check that your monitor is compatible with your graphics card
and that you’ve installed the correct monitor software, if your monitor came with
installation software.
m If you see a sequence of two short flashes and a long flash, the monitor is detecting a
problem with a backlighting lamp. Contact an Apple-authorized dealer or service provider.
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