NEC POWERMATE PRO2180 - SERVICE MANUAL 1996 Service Manual page 136

4-10 Maintenance and Troubleshooting
Problem
Keyboard or mouse
malfunction
Monitor
malfunction
Table Section 4-6 Problems and Solutions
Symptom
Monitor has prompt, but
cannot input data.
Unable to synchronize
display.
Wavy display.
Blank display.
Solution
1. Check that keyboard/mouse is plugged
in.
2. Check password (see Section 2).
3. Disable password (see Section 2).
4. Replace keyboard (or mouse).
5. Replace system board.
1. Adjust the monitor's synchronization
controls.
2. Check that the monitor's resolution
matches the video setting or the video
driver used (see Section 1).
3. Check that the utility is not selecting a
refresh rate/resolution that is not
supported by the monitor.
4. Check that the driver used matches the
capabilities of the video board and
WRAM.
1. Check that the computer and monitor
are not near motors or electric fields.
1. Press any key or move mouse to
ensure power management has not
blanked the display
2. Check that the VGA connector is
attached to the video board at the rear of
the system.
3. Check that the monitor power ON/OFF
switch is ON.
4. Check cable connections between the
AC power supply and monitor.
5. Adjust brightness and contrast controls
on the monitor.
6. Check cable connections between the
monitor connector and the system board
(or optional video board).
7. Replace video board.
8. Replace monitor.