NEC POWERMATE PRO2180 - SERVICE MANUAL 1996 Service Manual page 134

4-8 Maintenance and Troubleshooting
Problem
Power supply
malfunction
Operating system
does not boot
Table Section 4-6 Problems and Solutions
Symptom
Any one or more 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 the power supply
specifications.
3. Replace power supply.
1. Check system configuration and switch
settings (refer to Appendix B).
2. Verify that drives are enabled.
3. Reseat SIMMs and option boards in
their connectors. Inspect system board for
dropped objects.
4. Remove option boards and reboot.
5. Replace system board.
1. Press F1 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 Section 2),
then power-on the computer.
2. Check condition of selected bootload
device (diskette or hard disk) for bad boot
track or incorrect OS files.
3. Try booting OS from diskette or recopy
OS files onto hard disk.
4. Verify correct hard disk is selected.