Memory Problems - Lenovo ThinkEdge SE350 V2 Hardware Maintenance Manual

KVM switch problems
1. Make sure that the KVM switch is supported by your server.
2. Make sure that the KVM switch is powered on correctly.
3. If the keyboard, mouse or monitor can be operated normally with direct connection to the server, then
replace the KVM switch.
USB-device does not work
1. Make sure that:
• The correct USB device driver is installed.
• The operating system supports USB devices.
2. Make sure that the USB configuration options are set correctly in system setup.
Restart the server and press key according to the on-screen instructions to display the LXPM system
setup interface. (For more information, see the "Startup" section in the LXPM documentation compatible
with your server at
https://pubs.lenovo.com/lxpm-overview/
and I/O Ports ➙ USB Configuration.
3. If you are using a USB hub, disconnect the USB device from the hub and connect it directly to the
server.

Memory problems

Use this information to resolve issues related to memory.
Common memory problems
• "Displayed system memory less than installed physical memory" on page 163
• Invalid memory population detected
Displayed system memory less than installed physical memory
Complete the following procedure to solve the problem.
Note: Each time you install or remove a memory module, you must disconnect the server from the power
source; then, wait 10 seconds before restarting the server.
1. Make sure that:
• No error LEDs are lit. See
• No memory module error LEDs are lit on the system board.
• Memory mirrored channel does not account for the discrepancy.
• The memory modules are seated correctly.
• You have installed the correct type of memory module (see
order" on page 5
• After changing or replacing a memory module, memory configuration is updated accordingly in the
Setup Utility.
• All banks of memory are enabled. The server might have automatically disabled a memory bank when
it detected a problem, or a memory bank might have been manually disabled.
• There is no memory mismatch when the server is at the minimum memory configuration.
2. Reseat the memory modules, and then restart the server.
3. Check the POST error log:
• If a memory module was disabled by a systems-management interrupt (SMI), replace the memory
module.
"Troubleshooting by system LEDs" on page
for requirements).
.) Then, click System Settings ➙ Devices
151.
"Memory module installation rules and
.
Chapter 3 Problem determination
163