4-10 Maintenance and Troubleshooting
Table Section 4-6 Problems and Solutions
Problem Symptom Solution
Keyboard or mouse
malfunction
Monitor has prompt, but cannot
input data.
1. Check that keyboard/mouse is
plugged in.
2. Check password utility (see
Section 2).
3. Disable password utility (see
Section 2).
4. Replace keyboard (or mouse).
5. Replace system board.
Monitor malfunction Unable to synchronize display.
1. Adjust the monitor's synchronization
knobs.
2. Check that the monitor's resolution
matches the video setting or the video
driver used (see Section 1). The NEC
SVGA Monitor supports up to 1024 x
768. Most monitors don't support
resolutions above 640 x 480 (VGA
monitors).
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 built-in video
controller and DRAM.
Wavy display.
1. Check that the computer and
monitor are not near motors or electric
fields.
Blank display.
1. Check that built-in VGA (see
Section 2) (or optional video board if
installed) is enabled.
2. Check that the monitor power
ON/OFF switch is ON.
3. Check cable connections between
the AC power supply and monitor.
4. Adjust brightness and contrast
controls on the monitor.
5. Check cable connections between
the monitor connector and the system
board (or optional video board).
6. Replace system or video board.
7. Replace monitor.
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