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Light path diagnostics LEDs
The following table describes the LEDs on the light path diagnostics panel and on
the system board, and suggested actions to correct the detected problems.
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, Type 7981," on page 53 to determine which components are customer
replaceable units (CRU) and which components are field replaceable units (FRU).
v If an action step is preceded by "(Trained service technician only)," that step must be performed only by a
trained service technician.
Lit light path
diagnostics LED
Description
None
An error has occurred and cannot be isolated,
or the service processor has failed.
DIMM x error
A memory error occurred.
Microprocessor x
The microprocessor has failed.
error
MIS
The microprocessors do not match.
(Microprocessor
mismatch)
NMI (NMI error)
The system board has failed.
S BRD (System
The system board has failed
board error)
40
BladeCenter HS20 Type 7981: Problem Determination and Service Guide
Action
1. Make sure that the light path diagnostics
LED is lit to ensure that there is enough
power in the blade server to light the rest
of the LEDs.
2. Check the BMC log for information about
an error that is not represented by a light
path diagnostics LED.
1. Make sure that the DIMM indicated by the
lit LED is supported.
2. Reseat the DIMM that is indicated by the lit
LED.
3. Replace the DIMM that is indicated by the
lit LED.
Note: Multiple DIMM LEDs do not necessarily
indicate multiple DIMM failures. If more than
one DIMM LED is lit, reseat or replace one
DIMM at a time until the error is corrected.
1. (Trained service technician only) Make sure
that the microprocessor that is indicated by
the lit LED is installed correctly. (See
"Removing a microprocessor and heat sink"
on page 72 for installation instructions.)
2. (Trained service technician only) Replace
the microprocessor that is indicated by the
lit LED.
Make sure that microprocessors 1 and 2 are
identical (number of cores, cache size and
type, clock speed, internal and external clock
frequencies); also, see "Troubleshooting tables"
on page 25.
1. Replace the blade server cover, reinsert
the blade server in the BladeCenter unit,
and then restart the blade server. Check
the BMC log for information about the error.
2. (Trained service technician only) Replace
the system board assembly.
(Trained service technician only) Replace the
system board assembly.
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