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 the 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://sysmgt.lenovofiles.com/help/topic/lxpm_frontend/lxpm_product_page.html.
Then, click System Settings ➙ Devices 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
See this section to resolve issues related to memory.
•
“Multiple memory modules in a channel identified as failing” on page 471
• “Displayed system memory is less than installed physical memory” on page 472
• “Invalid memory population detected” on page 472
Multiple memory modules in a channel identified as failing
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.
Complete the following procedure to solve the problem.
1. Reseat the memory modules; then, restart the server.
2. Remove the highest-numbered memory module of those that are identified and replace it with an
identical known good memory module; then, restart the server. Repeat as necessary. If the failures
continue after all identified memory modules are replaced, go to step 4.
3. Return the removed memory modules, one at a time, to their original connectors, restarting the server
after each memory module, until a memory module fails. Replace each failing memory module with an
identical known good memory module, restarting the server after each memory module replacement.
Repeat step 3 until you have tested all removed memory modules.
4. Replace the highest-numbered memory module of those identified; then, restart the server. Repeat as
necessary.
5. Reverse the memory modules between the channels (of the same processor), and then restart the
server. If the problem is related to a memory module, replace the failing memory module.
6. (Trained technicians only) Install the failing memory module into a memory module connector for
processor 2 (if installed) to verify that the problem is not the processor or the memory module connector.
7. (Trained technicians only) Replace the system board.
Chapter 8. Problem determination 471
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