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Power supply LEDs

This topic provides the location of the power supply LEDs.

The following minimum configuration is required for the ac power LED on the power supply to be lit:

  • Power supply

  • Power cord

  • Appropriate input power from the power source

The following minimum configuration is required for the server to start:

  • Two processors installed

  • Two 16 GB DIMMs

  • At least one 2.5-inch drive installed

  • One functioning power supply with input power cord

Note
For troubleshooting purposes only, the server can be started with one processor, one 16 GB DIMM, no hard drives, and a single power supply with an input power cable. This is not a supported operational configuration.

The following table describes the problems that are indicated by various combinations of the power-supply LEDs and the power LED on the front operator panel and suggested actions to correct the detected problems. See Figure 2 for LED locations.

Power supply LEDsDescriptionActionNote
1
AC

2
DC

3
Error

OnOnOffNormal operation The server is functioning correctly.
OffOffOffNo power to the power supply, a problem with the input power source, or the power supply has failed.

  1. Check the input power to the server (voltage and frequency).

  2. Make sure that the power cord is connected to a functioning and supported power source.

  3. Replace the power supply.

 
OffOffOnNo input power to the power supply or the power supply has detected an internal problem.

  1. Make sure that the power cord is connected to a functioning power source.

  2. Replace the power supply.

This happens only when a second power supply is providing power to the server
OffOnOffThe power supply has failed.Replace the power supply. 
OffOnOnThe power supply has failed.Replace the power supply. 
OnOffOff

The system is shut down (server is connected to power).

The system has overloaded the power supply.

Remove options or add an additional power supply.

If the system is shut down, this is a normal condition.

The LED may go off for less than a minute then back on during an input power cycle operation initiated by the Lenovo XClarity Controller.

OnOnOff

The system is on (normal operation)

The system is on (not operating): power-supply not fully seated, faulty system board, or faulty power-supply.

  1. Reseat the power supply.

  2. Replace the power-supply.

  3. Replace the system board.

It usually indicates the power supply is not fully seated.
OnOffOnFaulty power supply.Replace the power supply. 
OnOnOnFaulty power supply.Replace the power supply.