The following table describes the problems that are indicated by various
combinations of the power-supply LEDs on a dc power supply and suggested
actions to correct the detected problems.
DC power-supply LEDs
Description Action NotesIN OK OUT OK Error (!)
On On Off Normal operation
Off Off Off No dc power to the
server or a problem
with the dc power
source.
1. Check the dc power to the
server.
2. Make sure that the power
cord is connected to a
functioning power source.
3. Restart the server. If the error
remains, check the
power-supply LEDs.
4. Replace the power-supply.
This is a normal
condition when no dc
power is present.
Off Off On No dc power to the
server or a problem
with the dc power
source and the
power-supply had
detected an internal
problem.
v Make sure that the power cord
is connected to a functioning
power source.
v Replace the power supply
(see the documentation that
comes with the power supply
for instructions).
This happens only
when a second power
supply is providing
power to the server.
Off On Off Faulty
power-supply
Replace the power supply.
Off On On Faulty
power-supply
Replace the power supply.
On Off Off Power-supply not
fully seated, faulty
system board, or
faulty power-supply
1. (Trained service technician
only) Reseat the power
supply.
2. If a power channel error LED
on the system board is not lit,
replace the power-supply
(see the documentation that
comes with the power supply
for instructions).
3. If a power channel error LED
on the system board is lit,
(trained service technician
only) replace the system
board.
Typically indicates a
power-supply is not
fully seated.
On Off On Faulty
power-supply
Replace the power supply.
On On On Power-supply is
faulty but still
operational
Replace the power supply.
Chapter 3. Diagnostics 71
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