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
CPU An invalid microprocessor
configuration or a microprocessor
has failed (both the CPU LED and
the CNFG LED might be lit).
1. If the CNFG LED is 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 microprocessor and heat sink” on
page 245 for additional information about
microprocessor requirements) and use the Setup utility
and select System Information → System Summary
→ Processor Details to verify the microprocessors
information.
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 a microprocessor failure occurs, complete the following
steps:
a. (Trained service technician only) Make sure that the
failing microprocessor, which is indicated by a lit LED
on the system board, is installed correctly. See
“Installing a microprocessor and heat sink” on page
245 for information about installation and
requirements.
b. For more information, go to http://www.ibm.com/
systems/support/supportsite.wss/
docdisplay?brandind=5000008&lndocid=SERV-CALL.
VRM Reserved.
Chapter 3. Diagnostics 109
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