NEC PowerMate Professional 9000E Series Service Manual page 143

Problem
Memory malfunction
Modem board
malfunction
Keyboard or mouse
malfunction
Monitor malfunction
8-8 Troubleshooting
Problems and Solutions
Symptom
Cannot access hard drive.
Total memory not recognized.
No output from board.
Monitor has prompt, but cannot
input data using keyboard or
mouse.
Unable to synchronize display.
Wavy display.
Solution
1. Check signal/power connections
between hard disk, PCB, power supply.
2. Check hard drive jumper settings.
3. Check power supply.
4. Check hard drive cable and hard drive.
Replace as necessary.
5. Replace system board (or hard drive
controller PCB if the system board
controller is not used).
6. Replace riser board.
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 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 2).
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 computer and monitor
are not near motors or electric fields.