IBM System x3550 M3 Type 4254 Problem Determination And Service Guide

Table 7. Light path diagnostics panel LEDs (continued)
v Follow the suggested actions in the order in which they are listed in the Action column until the problem
is solved.
v See Chapter 4, “Parts listing, System x3550 M3 Types 4254 and 7944,” on page 159 to determine which
components are customer replaceable units (CRU) and which components are field replaceable units
(FRU).
v If an action step is preceded by "(Trained service technician only)," that step must be performed only by a
trained service technician.
LED Description Action
MEM An invalid memory configuration
or a memory error has occurred
(both the MEM LED and CNFG
LED might be lit).
1. If the MEM LED and the CNFG LED are lit, the system
issues an invalid memory configuration error. Complete
the following steps to correct the problem:
a. Make sure that the DIMM configuration is supported
(see “Installing a memory module” on page 195 for
DIMM requirements and installation sequence
information).
b. Replace the DIMMs with a supported configuration.
2. If the CNFG LED is not lit, the system might detect a
memory error. Complete the following steps to correct the
problem:
a. Update the server firmware to the latest level (see
“Updating the firmware” on page 255).
b. Reseat the DIMM.
c. Run the memory test to isolate the problem.
d. If the test indicates that a memory error has occurred
(check the system log), replace the failing DIMM,
which is indicated by the lit DIMM latch on the system
board (the DIMM LED is underneath the DIMM latch).
NMI A nonmaskable interrupt has
occurred, or the NMI button was
pressed.
Check the system-error log for information about the error.
CNFG A hardware configuration error
has occurred.
1. If the CNFG LED and the CPU LED are lit, complete the
following steps to correct the problem:
a. Check the microprocessors that were just installed to
make sure that they are compatible with each other
(see “Installing a microprocessor and heat sink” on
page 245 for additional information about
microprocessor requirements).
b. (Trained service technician only) Replace the
incompatible microprocessor.
c. Check the system-error logs for information about the
error. Replace any components that are identified in
the error log.
2. If the CNFG LED and the MEM LED are lit, complete the
following steps:
a. Make sure that the DIMM configuration is supported
(see “Installing a memory module” on page 195 for
DIMM requirements and installation sequence
information).
b. Replace the DIMMs with a supported configuration.
108 IBM System x3550 M3 Types 4254 and 7944: Problem Determination and Service Guide

IBM System x3550 M3 Type 4254 Specifications

General

Brand	IBM
Model	System x3550 M3 Type 4254
Category	Server
Language	English