IBM xSeries 240 81Y Hardware Maintenance Manual page 23

Table 1 (Page 2 of 2). Light path diagnostics
LED On Cause / Action
NMI A nonmaskable interrupt occurred.
1. If the PCI BUS A or PCI BUS B LED is on,
follow the instructions for those LEDs.
2. If the PCI BUS A or PCI BUS B LED is not on,
restart the server.
SMI A systems management event occurred. Restart the
server.
SERVICE An error has occurred on the service processor bus.
PROCESSOR Disconnect all power from the server for 30 seconds.
BUS Reconnect the power to the server; then, restart the
server.
POWER Power supply 1 has failed. Replace power supply 1.
SUPPLY 1
POWER Power supply 2 has failed. Replace power supply 2.
SUPPLY 2
POWER Power supply 3 has failed. Replace power supply 3.
SUPPLY 3
POWER Power supply redundancy has been lost.
SUPPLY
1. If one of the power supply LEDs is on, replace
NON
the indicated power supply.
REDUNDANT
2. Install an additional power supply to regain
redundancy.
FAN 1 Fan 1 has failed or is operating too slowly.
Notes:
1. An LED on the failing fan assembly will also be
on.
2. A failing fan can also cause the
TEMPERATURE and HDD LEDs to be on.
Replace fan 1.
FAN 2 Fan 2 has failed or is operating too slowly.
Notes:
1. An LED on the failing fan assembly will also be
on.
2. A failing fan can also cause the
TEMPERATURE and HDD LEDs to be on.
Replace fan 2.
FAN 3 Fan 3 has failed or is operating too slowly.
Notes:
1. An LED on the failing fan assembly will also be
on.
2. A failing fan can also cause the
TEMPERATURE and HDD LEDs to be on.
Replace fan 3.
TEMPERATURE The system temperature has exceeded a threshold
level.
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" on page 52.)
If the problem persists, go to "General checkout" on
page 6.
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xSeries 240