• Power supplies
5. If you just installed an optional device, remove it, and restart the server. If the server starts, you might
have installed more devices than the power supply supports.
Server does not power on
Complete the following steps until the problem is resolved:
1. Check the event log for any events related to the server not powering on.
2. Check for any LEDs that are flashing amber.
3. Check the power LED on the system board.
4. Reseat the power supply.
5. 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 less than installed physical memory” on page 158
• “Multiple memory modules in a channel identified as failing” on page 159
• “Attempt to change to another DCPMM mode fails” on page 160
• “Extra namespace appears in an interleaved region” on page 160
Displayed system memory less than installed physical memory
Complete the following steps until the problem is solved:
Note: Each time you install or remove a memory module, you must disconnect the solution from the power
source; then, wait 10 seconds before restarting the solution.
1. Make sure that:
• No error LEDs are lit on the operator information panel.
• 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 “Specifications” on page 2 for
requirements).
• If you changed the memory, you updated the memory configuration in the Setup utility.
• All banks of memory are enabled. The solution might have automatically disabled a memory bank
when it detected a problem, or a memory bank might have been manually disabled.
158
ThinkSystem SR570 Maintenance Manual
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