IBM System x3550 M4 Installation And User Manual page 35

Table 2. 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 If an action step is preceded by "(trained technician only)," that step must be performed only by a trained
technician.
LED Description
CPU When only the CPU LED is lit, a
microprocessor has failed.
CPU + CONFIG
When both the CPU LED and the
CONFIG LED are lit, the
microprocessor configuration is
invalid.
MEM When only the MEM LED is lit, a
memory error has occurred.
MEM + CONFIG
When both the MEM and CONFIG
LEDs are lit, the memory
configuration is invalid.
Action
If the CONFIG LED is not lit, a microprocessor failure occurs,
complete the following steps:
1. (Trained technician only) Make sure that the failing
microprocessor and its heat sink, which are indicated by a
lit LED on the system board, are installed correctly. See
"Installing a second microprocessor and heat sink" on
page 79 for information about installation and
requirements.
2. (Trained technician only) Replace the failing
microprocessor (see "Installing a second microprocessor
and heat sink" on page 79).
3. If the failure remains, go to http://www.ibm.com/systems/
support/supportsite.wss/docdisplay?brandind=5000008
&lndocid=SERV-CALL.
If the CONFIG LED and the CPU LED are lit, the system
issues an invalid microprocessor configuration error. Complete
the following steps to correct the problem:
1. Check the microprocessors that were just installed to
make sure that they are compatible with each other (see
"Installing a second microprocessor and heat sink" on
page 79 for additional information about microprocessor
requirements) and use the Setup utility and select System
Information → System Summary → Processor Details to
verify the microprocessors information.
2. (Trained technician only) Replace the incompatible
microprocessor.
3. Check the system-error logs for information about the
error. Replace any component that is identified in the error
log.
Note: Each time you install or remove a DIMM, you must
disconnect the server from the power source; then, wait 10
seconds before restarting the server.
If the CONFIG LED is not lit, the system might detect a
memory error. Complete the following steps to correct the
problem:
1. Update the server firmware to the latest level (see the
Problem Determination and Service Guide for more
information).
2. Reseat or swap the DIMMs with lit LED.
3. Check the system-event log in the Setup utility or IMM
error messages (see the Problem Determination and
Service Guide for more information).
4. Replace the failing DIMM (see "Installing a memory
module" on page 59).
If the MEM LED and the CONFIG LED are lit, check the
system-event log in the Setup utility or IMM2 error messages
(see the Problem Determination and Service Guide for more
information).
Chapter 1. The System x3550 M4 server
19