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 Action
CPU When only the CPU LED is lit, a
microprocessor has failed.
When both the CPU and CONFIG
LEDs are lit, the microprocessor
configuration is invalid.
1. If the CONFIG LED is not lit, a microprocessor failure
occurs, complete the following steps:
a. (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 101 for information about
installation and requirements.
b. (Trained technician only) Replace the failing
microprocessor (see “Installing a second
microprocessor and heat sink” on page 101).
c. For more information, go to http://www.ibm.com/
systems/support/supportsite.wss/
docdisplay?brandind=5000008&lndocid=SERV-CALL.
2. 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:
a. 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 101 for additional information about
microprocessor requirements).
b. (Trained technician only) Replace the incompatible
microprocessor.
c. Check the system-error logs for information about the
error. Replace any component that is identified in the
error log.
MEM When only the MEM LED is lit, a
memory error has occurred.
When both the MEM and CONFIG
LEDs are lit, the memory
configuration is invalid.
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.
1. If the CONFIG 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 the
Problem Determination and Service Guide for more
information).
b. Reseat or swap the DIMMs.
c. Check the system-event log in the Setup utility or IMM
error messages (see the Problem Determination and
Service Guide for more information).
d. Replace the failing DIMM (see “Installing a memory
module” on page 107).
2. If the MEM LED and the CONFIG LED are lit, check the
system-event log in the Setup utility or IMM error
messages (see the Problem Determination and Service
Guide for more information).
Chapter 1. The System x3650 M4 server 21
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