Troubleshooting : Dell M770 Color Monitor User's Guide
Back to Contents
Page
Troubleshooting : Dell™
M770 Color Monitor User's Guide
Troubleshooting
Features • Common Problems • Graphics
Troubleshooting
Features
Your monitor includes features to
help you troubleshoot problems.
Monitor Self Test
Your monitor provides a self test
feature which allows you to check if your monitor is functioning properly. If
your monitor and computer are properly connected but the monitor screen remains
dark, use the following steps to perform the monitor self test:
1. Power OFF both your computer and
the monitor.
2. Unplug the video cable from the
computer or video card.
3. Power ON the monitor.
If the monitor is functioning
properly, you will see a flashing RGB box with a white border and black text
inside stating:
This box will also appear during
normal operation of your system if the video cable becomes disconnected or
damaged.
The LED stays green in self-test
mode.
The self-test pattern remains on
in the self-test mode.
4. Power off your monitor and reconnect
the video cable, then power on both your computer and monitor.
If your monitor screen remains blank
after using the above procedure, check your video controller and computer system;
your monitor is functioning properly.
Common
Problems
Before calling for
service, check the information in this section to see if you can remedy any
problems yourself.
No Picture
- Check to see
that both the monitor and the computer are plugged in and turned on.
"Check Signal
Cable" appears
- Check the signal
cable connection between the computer and the monitor.
- Use the monitor
self test described on Troubleshooting.
Color is not uniform.
- Activate the
Degauss feature using the OSD DEGAUSS menu.
- Adjust the color
settings using the OSD COLOR menu.
White does not look
white.
- Activate the
Degauss feature using the OSD DEGAUSS menu.
- Adjust the color
settings using the OSD COLOR menu.
Screen image is
not centered or sized properly.
- Adjust the Horizontal
and Vertical position settings and/or the Height and Width settings using
the OSD.
Edges of the image
are curved.
- Adjust the shape
of the display using the OSD GEOMETRY menu.
Wavy or elliptical
(moiré) pattern is visible.
- Clear the moiré
pattern using the OSD H/V-MOIRE menu in "ADVANCED CONTROLS" menu.
The image is too
light or too dark.
- Adjust the Brightness
and Contrast settings using the
and 
buttons.
Cannot adjust monitor
with the buttons on the front panel.
- Press
to check video mode if it is factory preset or new mode, select other video
mode in PC display properties.
- Please contact
Dell customer service.
White lines show
red or blue shades at the edges.
- Check surroundings
for magnetic fields.
- Perform monitor
degauss.
- Adjust rotation
in GEOMETRY menu.
Picture is fuzzy.
- Perform monitor
reset.
- Eliminate accessories
(i.e., Video extension cables)
- Select "RESET"
--> YES in main menu.
- Select "MOIRÉ"
from advanced controls and set H/V moiré at 0%.
Signal out of range.
- Reboot PC.
- Press F8 while
reboot is processing.
- Select safe mode.
- Select control
panel to decrease resolution.
- Restart your
computer.
(If Horizontal or
Vertical frequency is outside monitor scanning range, please change the video
mode to lower resolution/refresh rate.)
Back to Contents
Page
| 
