Service Manual

32 Troubleshooting
CHECK THE DIAGNOSTIC LIGHTS — See "Power Lights" on page 9.
C
HECK THE MONITOR SETTINGS — See the monitor documentation for instructions
on adjusting the contrast and brightness, demagnetizing (degaussing) the monitor,
and running the monitor self-test.
M
OVE THE SUBWOOFER AWAY FROM THE MONITOR — If your speaker system
includes a subwoofer, ensure that the subwoofer is positioned at least 60 centimeters
(2 feet) away from the monitor.
M
OVE THE MONITOR AWAY FROM EXTERNAL POWER SOURCES — Fans, fluorescent
lights, halogen lamps, and other electrical devices can cause the screen image to
appear shaky. Turn off nearby devices to check for interference.
R
OTATE THE MONITOR TO ELIMINATE SUNLIGHT GLARE AND POSSIBLE
INTERFERENCE
ADJUST THE WINDOWS DISPLAY SETTINGS —
Windows XP:
1 Click Start → Control Panel → Appearance and Themes .
2 Click the area you want to change or click the Display icon.
3 Try different settings for Color quality and Screen resolution .
Windows Vista:
1 Click Start → Control Panel → Hardware and Sound → Personalization →
Display Settings .
2 Adjust Resolution and Colors settings, as needed.
3D image quality is poor
CHECK THE GRAPHICS CARD POWER CABLE CONNECTION — Ensure that the power
cable for the graphics card(s) is correctly attached to the card.
C
HECK THE MONITOR SETTINGS — See the monitor documentation for instructions
on adjusting the contrast and brightness, demagnetizing (degaussing) the monitor,
and running the monitor self-test.
Only part of the display is readable
CONNECT AN EXTERNAL MONITOR —
1 Shut down your computer and connect an external monitor to the
computer.
2 Turn on the computer and the monitor and adjust the monitor brightness
and contrast controls.
If the external monitor works, the computer display or video controller may be