IBM Netfinity 4500R User Reference Manual page 148

Lit LED on
diagnostics
panel
OVER The system has exceeded the power
capabilities of the installed power supply.
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.
Table 19. Light path diagnostics
136
IBM® Netfinity® 4500R User's Reference
Cause
A failing fan can also cause the
TEMP LED to be on.
Action
Remove optional devices from the server to
reduce the power requirements.
1. If the PCI A or PCI B LED is on, follow
the instructions for that LED.
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 "Specifications and
features" on page 2.)
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 lit,
make sure that microprocessor is
installed correctly and seated correctly.
See "Installing a microprocessor" on
page 83.
3. If the problem persists, replace the
microprocessor.
If the problem persists, have the system
serviced.