IBM System x3750 M4 Installation And Service Manual page 193

Table 23. Light path diagnostics panel LEDs (continued)
v Follow the suggested actions in the order in which they are listed in the Action column until the problem is
solved.
v See Chapter 3, "Parts listing", to determine which components are customer replaceable units (CRU) and
which components are field replaceable units (FRU).
v If a action step is preceded by (Trained service technician only), that step must be performed only by a trained
service technician.
LED Description
PCI An error has occurred on a
PCI bus on the system board
or on the PCI riser card. An
additional LED might be lit
on one of the PCI slots on
the system board or the riser
card.
NMI A nonmaskable interrupt has
occurred.
CONFIG A hardware configuration
error has occurred.
LINK Reserved.
Action
1. Check the IMM event log for information about the error.
2. Check the LEDs on the system board or PCI riser card to identify
the component that caused the error.
3. If you cannot isolate the failing adapter by using the LEDs and
the information in the IMM event log, remove one adapter at a
time from the failing PCI bus; and restart the server after each
adapter is removed.
4. Replace the following components, in the order shown, restarting
the server each time:
v PCI riser card
v (Trained service technician only) Replace the system board.
Check the IMM event log for information about the error.
1. If the CONFIG LED and the CPU LED are lit, complete the
following steps to correct the problem:
a. Check the microprocessors that were just installed to make
sure that they are compatible with each other (see "Installing
an additional microprocessor and heat sink" on page 95 for
additional information about microprocessor requirements)
and use the Setup utility and select System Information →
System Summary → Processor to verify the microprocessors
information.
b. (Trained service technician only) Replace the incompatible
microprocessor.
c. Check the IMM event logs for information about the error.
Replace any components that are identified in the error log.
2. If the CONFIG LED and the MEM LED are both lit, complete the
following steps:
a. Make sure that the DIMM configuration is supported (see
"Installing a memory module" on page 43 for DIMM
requirements and installation sequence information).
b. Replace the DIMMs with a supported configuration.
Chapter 4. Troubleshooting
175