Memory Module Problems - Lenovo ThinkServer RD630 Hardware Maintenance Manual

Symptom
Multiple hard disk drives fail.

Memory module problems

Follow the suggested actions for the corresponding symptom in the order in which they are listed until the
problem is solved. If none of these actions solve the problem, see "Troubleshooting procedure" on page 167
for the subsequent steps you should check after using the information in this topic. If the problem still cannot
be solved, seek technical assistance. See Chapter 8 "Getting information, help, and service" on page 173.
Notes:
• If you are instructed to remove, install, or replace any CRUs, refer to the related procedure in Chapter 6
"Installing, removing, or replacing hardware" on page 71.
• If an action step is preceded by "(Trained service technician only)," this action step is reserved for a trained
service technician and must be performed only by a trained service technician.
Symptom
The amount of system memory that is displayed is less
than the total capacity of the installed physical memory
modules and you suspect a memory module problem.
Action
backplane without bowing or causing movement of
the backplane.
6. Ensure that the cable connection is correct. See
"Mini-SAS to mini-SAS signal cable connections" on
page 39.
7. Reconnect the backplane power cable and repeat
step 1 through step 4.
8. Reconnect the backplane signal cable and repeat
step 1 through step 4.
9. If you suspect a problem with the backplane signal
cable or the backplane:
a. Replace the affected backplane signal cable.
b. Replace the affected backplane.
1. Ensure that the cable connection is correct. See
"Mini-SAS to mini-SAS signal cable connections" on
page 39.
2. Reconnect the power cables.
3. Reconnect the signal cables.
4. Replace the affected signal cables.
5. If you suspect a problem with the backplane, replace
the affected backplane.
Action
1. Ensure that:
• All memory modules are the correct type
supported by the server. See "Memory module
installation rules" on page 82.
• You followed the memory module installation
rules. See "Memory module installation rules" on
page 82.
• All memory modules are seated correctly and
securely.
• The system firmware is up-to-date.
2. Reinstall the memory modules.
3. Replace the suspect memory modules.
.
Chapter 7 Troubleshooting and diagnostics
171