Lenovo NeXtScale nx360 M5 Installation And Service Manual page 74

The following minimum configuration is required for the DC LED on the power supply to be lit:
• Power supply
• Power cord
Note: You must turn on the server for the DC LED on the power supply to be lit.
The following illustration shows the locations of the power-supply LEDs on the ac power supply.
AC power DC power
LED (green) 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
Error (!)
AC DC
On On
Off Off
Off Off
Off On
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Power-supply
error LED (yellow)
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.
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.
Notes
This is a normal
condition when no ac
power is present.