IBM NeXtScale nx360 M4 Installation And Service Manual page 72

The following illustration shows the locations of the power-supply LEDs on the ac
power supply.
AC power
LED (green)
Figure 13. AC power-supply LEDs
The following table describes the problems that are indicated by various
combinations of the power-supply LEDs on an ac power supply and suggested
actions to correct the detected problems.
AC power-supply LEDs
AC DC
On On
Off Off
Off Off
Off On
Off On
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IBM NeXtScale nx360 M4 Type 5455: Installation and Service Guide
DC power
LED (green)
Error (!) Description
Off Normal operation.
Off No ac power to the
server or a problem
with the ac power
source.
On The power supply
has failed.
Off The power supply
has failed.
On The power supply
has failed.
Power-supply
error LED (yellow)
Action
1. Check the ac 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.
Notes
This is a normal
condition when no ac
power is present.