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. If the problem remains,
replace the power-supply.
This is a normal
condition when no dc
power is present.
Off Off On The power supply
has failed.
Replace the power supply.
Off On Off The power supply
has failed.
Replace the power supply.
Off On On The power supply
has failed.
Replace the power supply.
Chapter 1. The System x3550 M4 server 25
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