Microprocessor Problems - IBM x3550 M4 Type 7914 Installation And Service Manual

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.
v Go to the IBM support website at http://www.ibm.com/supportportal/ to check for technical information, hints,
tips, and new device drivers or to submit a request for information.
Symptom
Multiple DIMMs in a channel
are identified as failing.

Microprocessor problems

Use this information to solve microprocessor problems.
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.
v Go to the IBM support website at http://www.ibm.com/supportportal/ to check for technical information, hints,
tips, and new device drivers or to submit a request for information.
Symptom
The server goes directly to the
POST Event Viewer when it is
turned on.
Action
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. Reseat the DIMMs; then, restart the server.
2. Remove the highest-numbered DIMM of those that are identified and replace it
with an identical known good DIMM; then, restart the server. Repeat as
necessary. If the failures continue after all identified DIMMs are replaced, go to
step 4.
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 highest-numbered DIMM of those identified; 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 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 technician only) Replace the system board.
Action
1. Correct any errors that are indicated by the light path diagnostics LEDs (see
"Light path diagnostics" on page 134).
2. Make sure that the server supports all the microprocessors and that the
microprocessors match in speed and cache size. To view the microprocessor
information, run the Setup utility and select System Information > System
Summary > Processor Details.
3. (Trained technician only) Make sure that microprocessor 1 is seated correctly.
4. (Trained technician only) Remove microprocessor 2 and restart the server.
5. Replace the following components one at a time, in the order shown, restarting
the server each time:
a. (Trained technician only) Microprocessor
b. (Trained technician only) System board
Chapter 4. Troubleshooting
161