Memory Problems - Lenovo ThinkSystem ST50 V2 Maintenance Manual

4. Disconnect and reconnect the front panel cable (see
location of the connector on the system board). If the problem persists, replace the front panel.
Server powers off unexpectedly
Complete the following steps until the problem is solved.
1. Make sure the room temperature does not cause overheating, and no object is blocking the airflow in
front and back of the server.
2. Remove any optional devices that were installed recently. System power problems caused by addition
of a device indicates this device is either incompatible or too much for the power supply to support.
3. Make sure the power cord is securely connected to the server and to a working electrical outlet.
Disconnect and reconnect or replace the server power cord.
4. Reseat the power supply. If the problem persists, replace the power supply.
Server does not power off
Complete the following steps until the problem is solved.
1. Determine whether you are using an Advanced Configuration and Power Interface (ACPI) or a non-ACPI
operating system. If you are using a non-ACPI operating system, complete the following steps:
a. Press
Ctrl+Alt+Delete
b. Turn off the server by pressing and holding the power button for five seconds.
c. Power on the server.
d. If the server fails POST and the power button does not work, disconnect the power cord for 20
seconds; then, reconnect the power cord and power on the server.
2. If the problem persists or if you are using an ACPI-aware operating system, suspect the system board.

Memory problems

Follow this procedure to resolve issues related to memory.
• "Displayed system memory less than installed physical memory" on page 165
Displayed system memory less than installed physical memory
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.
Complete the following steps until the problem is solved.
1. Check the system event log and resolve any related problems. To view the system event log, go to
Setup Utility and select Security ➙ System Event Log ➙ View System Event Log.
2. Make sure that:
• The DIMMs are supported by the server (see
• The DIMMs are properly installed. Examine if there is any gap between the connector and the DIMM.
Remove and install the DIMM if there is any.
3. If the server comes with Lenovo XClarity Provisioning Manager Lite, go to Diagnostics ➙ Memory test
to perform diagnostics on the DIMMs. Replace the DIMM that is displayed as faulty. Otherwise, skip to
the next step.
.
"System board components" on page 18
https://static.lenovo.com/us/en/serverproven/index.shtml
Chapter 4
for the
.
Problem determination
165
).