IBM 79463AU Installation And User Manual page 39

Table 2. 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", in the Problem Determination and Service Guide 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
MEM When only the MEM LED is lit, a
memory error has occurred.
When both the MEM and CNFG
LEDs are lit, the memory
configuration is invalid or the PCI
Option ROM is out of resource.
NMI A nonmaskable interrupt has
occurred, or the NMI button was
pressed.
Action
1. If the MEM LED and the CNFG LED are lit, complete the
following steps:
a. Check the system-event log in the Setup utility. If a
PCI Option ROM out-of-resource error log is present,
reduce the base system ROM or change the ROM
order. For detailed information, go to
http://www-947.ibm.com/systems/support/
supportsite.wss/docdisplay?lndocid=MIGR-5084743
&brandind=5000008.
b. Run the DSA memory test to isolate the problem (see
the Problem Determination and Service Guide for
more information).
v If the test reports that a memory error has occurred,
replace the failing DIMM, which is indicated by the
lit DIMM latch on the system board (the DIMM LED
is underneath the DIMM latch).
v If the test reports the memory configuration is
invalid, repopulate the DIMMs to a supported
configuration. (See "Installing a memory module" on
page 52 about memory configuration.)
2. If the CNFG LED is not lit, the system might detect a
memory error. Complete the following steps to correct the
problem:
a. Update the server firmware to the latest level (see the
Problem Determination and Service Guide for more
information).
b. Reseat the DIMM.
c. Run the memory test to isolate the problem.
d. If the test indicates that a memory error has occurred
(check the system log), replace the failing DIMM,
which is indicated by the lit DIMM latch on the system
board (the DIMM LED is underneath the DIMM latch).
Check the system-error log for information about the error.
Chapter 1. The System x3550 M2 server
23