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• Follow the suggested actions in the order in which they are listed in the Action column until the problem is
solved.
Chapter 4 "Parts listing, Lenovo System x3550 M3 Type 4254 and 7944" on page 403
• See
components are customer replaceable units (CRU) and which components are field replaceable units (FRU).
• If an action step is preceded by "(Trained service technician only)," that step must be performed only by a
Trained service technician.
• For additional memory troubleshooting information, refer to the "Troubleshooting Memory - IBM
BladeCenter and System x" document at
.
5081319
• Go to the IBM support website at
tips, and new device drivers or to submit a request for information.
Symptom
Microprocessor problems
Use this information to solve microprocessor problems.
http://www.ibm.com/support/entry/portal/docdisplay?lndocid=MIGR-
http://www.ibm.com/supportportal/
Action
3. Return the removed DIMMs, one at a time, to their original connectors,
restarting the server after each DIMM, until a DIMM fails. Replace each failing
DIMM with an identical known good DIMM, restarting the server after each
DIMM replacement. Repeat step 3 until you have tested all removed DIMMs.
4. Replace the DIMM with lit error LED; then, restart the server. Repeat as
necessary.
5. Reverse the DIMMs between the channels (of the same microprocessor), and
then restart the server. If the problem is related to a DIMM, replace the failing
DIMM.
6. (Trained service technician only) Install the failing DIMM into a DIMM connector
for microprocessor 2 (if installed) to verify that the problem is not the
microprocessor or the DIMM connector.
7. (Trained service technician only) Replace the system board.
to determine which
to check for technical information, hints,
.
Chapter 3
Diagnostics
369
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