NEC POWERMATE PROFESSIONAL 9000 Service Manual page 211

4-10 Maintenance and Troubleshooting
Problem
Power supply
malfunction
Operating system
does not boot
Table 4-2 Problems and Solutions
Symptom
Any of the following conditions
could occur:
Front panel lamps out, diskette
and/or hard drives do not spin,
monitor blank, interface ports
not working, and keyboard
lamp out and/or cannot input
from keyboard.
Intermittent beeping at power-
on. Computer beeps more than
once and is unable to complete
boot-up.
"Invalid Configuration"
message displayed.
Computer halts during loading
sequence.
Solution
1. Perform steps 1 through 4 listed in
this table under No Power.
2. Check power supply voltages.
Voltages should be measured with a
load on them (system board plugged in).
See Appendix A for connector pin
assignments and Section 1 for power
supply specifications.
3. Replace the power supply.
1. Check system configuration (see
Section 2).
2. Check all jumper settings and verify
that drives are enabled (see appendices
and Section 2).
3. Reseat DIMMs and option boards in
their connectors. Inspect system board
for foreign objects such as paper clips.
4. Remove option boards and reboot.
5. Replace system board.
F2
1. Press to run Setup and correct the
parameters.
2. Replace the CMOS battery if the date
and time must be set each time the
computer is powered on.
1. Power the computer off. Check for
proper jumper settings (see
appendices), then power-on the
computer.
2. Check condition of selected bootload
device (diskette, disc, or hard disk) for
bad boot track or incorrect OS files.
3. Try booting OS from diskette or disc,
or recopy OS files onto hard disk.
4. Verify correct hard disk is selected.