IBM System x3550 M4 Installation And User Manual page 41

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
IN OK OUT OK Error (!)
On On
Off Off
Off Off
Off On
Off On
Description
Off Normal operation.
Off No dc power to the
server or a problem
with the dc power
source.
On The power supply
has failed.
Off The power supply
has failed.
On The power supply
has failed.
Action
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.
Replace the power supply.
Replace the power supply.
Replace the power supply.
Chapter 1. The System x3550 M4 server
Notes
This is a normal
condition when no dc
power is present.
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