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.
v Go to the IBM support Web site at http://www.ibm.com/systems/support/ to check for technical
information, hints, tips, and new device drivers or to submit a request for information.
Error code Description Action
0051003 Uncorrectable DIMM error
1. Update the server firmware to the latest level (see
“Updating the firmware” on page 255).
2. Replace the failing DIMM.
3. (Trained service technician only) If the same
DIMM connector experiences a subsequent
uncorrectable error, reverse the positions of
microprocessor 1 and microprocessor 2.
4. (Trained service technician only) If the problem is
related to the microprocessor, replace the failing
microprocessor.
5. (Trained service technician only) If the problem is
not related to the microprocessor, replace the
system board.
0051004 DIMM presence detected read/write failure
1. Update the server firmware to the latest level (see
“Updating the firmware” on page 255).
2. Reseat the DIMMs.
3. Install DIMMs in the correct sequence (see
“Installing a memory module” on page 195).
4. Replace the failing DIMM.
5. (Trained service technician only) Replace the
system board.
0051006 DIMM mismatch detected Make sure that the DIMMs match and are installed in
the correct sequence (see “Installing a memory
module” on page 195).
0051009 No memory detected.
1. Make sure that the server contains DIMMs.
2. Reseat the DIMMs.
3. Install DIMMs in the correct sequence (see
“Installing a memory module” on page 195).
4. (Trained service technician only) Replace the
failing microprocessor.
5. (Trained service technician only) Replace the
system board.
005100A No usable memory detected.
1. Make sure that the server contains DIMMs.
2. Reseat the DIMMs.
3. Install DIMMs in the correct sequence (see
“Installing a memory module” on page 195).
4. Clear CMOS memory to re-enable all the memory
connectors (see “System-board switches and
jumpers” on page 18).
Chapter 3. Diagnostics 31
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