3. Check for any LEDs that are flashing amber.
4. Check the power LED on the system board.
5. Reseat the power supply.
6. Replace the power supply.
Server does not power off
Complete the following steps until the problem is resolved:
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 the power-control button and holding it down for 5 seconds.
c. Restart the server.
d. If the server fails POST and the power-control button does not work, disconnect the power cord for
20 seconds; then, reconnect the power cord and restart the server.
2. If the problem remains or if you are using an ACPI-aware operating system, suspect the system board.
Memory problems
Use this information to resolve issues related to memory.
• “Displayed system memory is less than installed physical memory” on page 210
• “Multiple rows of DIMMs in a branch identified as failing” on page 211
Displayed system memory is less than installed physical memory
Complete the following steps until the problem is solved.
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.
1. Make sure that:
• No error LEDs are lit on the operator information panel.
• No DIMM 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.
• If you changed the memory, you updated the memory configuration 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. Check memory module event logs and run memory module diagnostics:
a. Identify the failing memory module, and install the failing memory module in a different slot.
b. Restart the server and check the memory module event logs. If the problem is related to the memory
module slot, replace the failing the memory module.
3. Reseat the DIMMs, and then restart the server.
4. Run memory diagnostics. When you start a server and press F11, the Lenovo XClarity Provisioning
Manager Lite V2 interface is displayed by default. You can perform memory diagnostics from this
interface. From the Diagnostic page, click Run Diagnostic ➙ Memory test.
210
ThinkSystem SR635 Maintenance Manual
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