NEC POWERMATE ES 5200 Service Manual page 234

Problem Symptom
Memory malfunction Total memory not recognized.
Modem board No output from board.
malfunction
Keyboard or mouse Monitor has prompt, but cannot
malfunction input data using keyboard or
mouse.
Monitor malfunction Blank display.
Problems and Solutions
Solution
1. Reseat DIMMs.
2. Systematically swap DIMMs.
3. Check to see if the DIMM configuration
is valid (see Section 4).
4. Replace DIMMs.
5. Replace system board.
1. Check interrupts (see Section 2).
2. Check DMA channels (see Section 4).
1. Check keyboard/mouse plugged in.
2. Check password (see sections 2, 4).
3. Disable password (see sections 2, 4).
4. Replace keyboard (or mouse).
5. Replace system board.
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. Check that the monitor cable is attached
to the video connector at the back of the
system.
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 graphics board.
7. Replace graphics board.
8. Replace monitor.
Troubleshooting 8-9