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Chapter 6. Solving problems 99
Diagnostic LEDs
You can use the diagnostic LEDs built into your server to quickly identify the type of
system error that occurred. Your server is designed so that LEDs remain illuminated
when the server shuts down, as long as the power supplies are operating properly.
This feature helps you to isolate the problem if an error causes the server to shut
down.
Error LED (on the
system board or
front panel)
System board or
front panel LED
on
Cause Action
On
A system error
was detected.
Check to see
which of the LEDs
on the system
board are on.
None The system error log is 75% or more
full or a Predictive Failure Analysis
(PFA) alert was logged.
Check the system error log and
correct any problems. See “Choices
available from the
Configuration/Setup main menu” on
page 12 for information about
clearing the error log. Disconnecting
the server from all power sources for
at least 20 seconds will turn off the
system error LED.
On DIMM 1, DIMM 2,
DIMM 3, or
DIMM 4 (system
board)
A memory error occurred. 1. Check the DIMM error LEDs on
the system board.
2. Replace the DIMM indicated by
the lit DIMM error LED.
On CPU 1 or CPU 2
(system board)
One of the microprocessors has failed,
or a microprocessor is installed
incorrectly.
1. Check the microprocessor error
LEDs on the system board. If a
microprocessor error LED is on
for a microprocessor connector
that has a terminator card
installed instead of a
microprocessor, the
microprocessors are not installed
in the correct order. See
“Installing and removing a
microprocessor” on page 54 for
information about the correct
order for installing
microprocessors. Otherwise,
continue with the next step.
2. Turn off the server, reseat the
microprocessor indicated by the
lit microprocessor error LED, and
restart the server.
3. If the problem persists, replace
the microprocessor.
If the problem persists, have the
system serviced.
On Fan 1, Fan 2, or
Fan 3 (system
board)
One of the fans has failed or is
operating too slowly.
The LED on the failing fan will be lit.
Contact an IBM service technician to
replace the fan.
Table 15. Diagnostic LEDs