NEC SP B-Series - Manual (Page 71)

Maintenance and Troubleshooting 4-5
Problems and Solutions
Problem Symptom Solution
No power Power lamp on computer does
not light. Check that the power cord is plugged into
the AC connector on the computer.
Check that the other end of the cord is
plugged into a live properly grounded AC
power outlet.
Check cable connections between the
power supply and the system board.
Systematically eliminate possible shorted
boards by removing cables and expansion
boards.
Check the +5 and +12 power supply
voltages (see Appendix B, “Connector Pin
Assignments”). Measure voltages with the
system board installed.
Replace the power supply.
Replace the system board.
Power supply
malfunction Any of the following conditions
can 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 the
keyboard.
Perform the first four checks in the solution
for the “No power” problem in this table.
Check power supply voltages. Voltages
should be measured with a load on them
(system board plugged in). See
Appendix B, “Connector Pin Assignments.”
Replace the power supply.
Operating system does
not boot Intermittent beeping at power on.
Computer beeps more than once
and is unable to complete
bootup. Check system configuration (see
Section 2, “Setup Utility”).
Check all jumper settings and verify that
drives are enabled (see Section 2, “Setup
Utility” and Appendix C, “System
Resources”).
Reseat DIMMs and option boards in their
connectors. Inspect system board for
dropped objects.
Remove option boards and reboot.
Replace system board.
“Invalid Configuration” message
displayed. Press F2 to run Setup and correct the
parameters.
Replace the CMOS battery if the date and
time must be set each time the computer is
powered on.