AC power
LED (green)
DC power
LED (green)
Power-supply
error LED (yellow)
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
Error (!)
Description
Action
Notes
On
On
Off
Normal operation.
Off
Off
Off
No ac power to the
server or a problem
with the ac power
source.
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.
This is a normal
condition when no ac
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.
52
IBM NeXtScale nx360 M4 Installation and Service Guide
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