NEC POWERMATE ES Series Service And Reference Manual page 100

Problem Symptom
Keyboard or mouse Monitor has prompt, but cannot
malfunction input data using keyboard or
mouse.
Monitor malfunction Unable to synchronize display.
Wavy display.
Blank display.
CD-ROM drive System power not on.
malfunction
Disc tray does not open.
7-8 Troubleshooting
Problems and Solutions
Solution
1. Check keyboard/mouse 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.
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.
1. Check that the system and monitor are
not near motors or electric fields.
1. Press any key or move the mouse to
ensure power management has not blanked
the display.
2. Check that the monitor power ON/OFF
switch is ON.
3. Adjust brightness and contrast controls
on the monitor.
4. Check that the monitor cable is attached
to the video connector at the back of the
system.
5. Check cable connections between the
AC power supply and monitor.
6. Replace monitor.
1. Turn system power on.
1. System power not on. Turn system
power on.
2. System power failed. Remove the system
cover, insert the end of a straightened paper
clip into the emergency eject hole on the
front of the CD-ROM drive, and gently press
inward until the tray opens.