Lenovo ThinkServer RD220 Hardware Maintenance Manual page 50

• Follow the suggested actions in the order in which they are listed in the Action column until the problem is
solved.
• See the parts listing in the Hardware Maintenance Manual to determine which components are customer
replaceable units (CRU) and which components are field replaceable units (FRU).
• If an action step is preceded by "(Trained service technician only)," that step must be performed only by
a trained service technician.
LED Description
MEM When only the MEM LED is lit, a
memory error has occurred.
When the MEM and CNFG LEDs are lit,
the memory configuration is not valid.
NMI A nonmaskable interrupt has occurred,
or the NMI button has been pressed.
CNFG A hardware configuration error has
occurred. (This LED is used with the
MEM and the CPU LEDs.)
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ThinkServer RD220 Hardware Maintenance Manual
Action
1. Determine whether the CNFG LED is also lit. If it is, run the
memory test exerciser to isolate the problem (see Hardware
Maintenance Manual for more information).
a. If the test reports that a memory error has occurred,
replace the failing DIMM, which is indicated by the lit LED
on the system board.
b. If the test reports the memory configuration is invalid,
repopulate the DIMMs to a supported configuration.
2. If the CNFG LED is not lit, one of the following conditions
should be present:
• The server did not boot and a failing DIMM LED is lit.
a. Check for a PFA log event in the System Event Log
(SEL)
b. Reseat the DIMM.
c. If the problem remains, move the DIMM to a different
slot.
1) If the DIMM LED lights up on the system board that
corresponds to this new DIMM socket, replace the
DIMM.
2) If the DIMM LED lights up on the system board that
corresponds to the original DIMM socket, replace
the system board (trained service technician only).
• The server booted and the failing DIMM is disabled and
the LED is lit.
a. If the LEDs are lit by two DIMMs, check the System
Event Log for PFA on one of the DIMMs, then replace
that DIMM. Otherwise, replace both DIMMs.
b. If the LED is lit by only one DIMM, replace that DIMM.
c. Re-enable the DIMM sockets in the server firmware
settings.
Check the system-event log for information about the error.