IBM xSeries 150 User Reference Manual page 110

Table 15. Light path diagnostics
Lit LED on
diagnostics
panel
NMI A nonmaskable interrupt occurred.
TEMP The system temperature has exceeded a
threshold level.
FAN A fan has failed or is operating too slowly.
Note:
MEM A memory error occurred.
CPU One of the microprocessors has failed or a
microprocessor is installed in the wrong
connector.
PCI A An error occurred on PCI bus A. An adapter in
PCI slot 1 or 2 on the system board caused the
error.
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IBM® xSeries 150 : User's Reference
Cause
A failing fan can also cause the TEMP
LED to be on.
Action
1. If the PCI A or PCI B LED is on, follow the
instructions for those LEDs.
2. If neither the PCI A or PCI B LED is on,
restart the server.
If the problem persists, have the system serviced.
1. Check to see if a fan has failed. If it has,
replace the fan.
2. Make sure the room temperature is not too
hot. (See "Features and specifications" on
page 1.)
If the problem persists, have the system serviced.
Check the LEDs on the fan assemblies and
replace the indicated fan assembly.
1. Check the DIMM failure LEDs on the system
board.
2. Replace the DIMM indicated by the lit
DIMM failure LED.
1. Check the microprocessor failure LEDs on
the system board.
2. If a microprocessor failure LED is on, make
sure the microprocessor is installed correctly
(see "Installing a microprocessor" on page
41) and seated correctly.
3. If the problem persists, replace the
microprocessor.
If the problem persists, have the system serviced.
1. Check the error log for additional
information. If the error log indicates a
problem with the integrated Ethernet
controller or the integrated SCSI controller,
have your system serviced.
2. If you cannot isolate the failing adapter from
the information in the error log, try to
determine the failing adapter by removing
one adapter at a time from PCI bus A (PCI
slots 1 and 2) and restarting the server after
each adapter is removed.
If the problem persists, have the system serviced.