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.
• Make sure that the power cord
is connected to a functioning
power source.
• Replace the power supply (see
the documentation that comes
with the power supply for
instructions).
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.
System pulse LEDs
The following LEDs are on the system board and monitors the system power-on and power-off sequencing
and boot progress.
See
“System-board LEDs” on page 21 for the location of these LEDs.
394
System x3550 M3Problem Determination and Service Guide
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