Memory Module Problems - Lenovo 70AL 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
153 for the subsequent steps you should check after using the information in this topic. If the problem
cannot be solved by yourself, seek technical assistance. See Chapter 8 "Getting information, help, and
service" on page 159.
Notes:
1. 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 65.
2. 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
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. If you have any diagnostic programs, run the
diagnostic programs to test the hard disk drives.
2. Ensure that the cable connection is correct. See
"Connecting the cables" on page 35.
3. Reconnect the power cable.
4. Reconnect the signal cable.
5. Replace the affected signal cable.
6. For hot-swap hard disk drives, 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 "Features" on page
7.
• You follow the memory module installation rules.
See "Memory module installation rules" on page
74.
• All memory modules are seated correctly and
securely.
• The system firmware is up-to-date.
2. If you have any diagnostic programs, run the
diagnostic programs to test the memory modules.
3. Reinstall the memory modules.
4. Replace the suspect memory modules.
5. (Trained service technician only) Replace the system
board.
.
Chapter 7 Troubleshooting and diagnostics
157