AC power-supply LEDs

Use this information to view AC power-supply LEDs.

The following illustration shows the location of the AC power-supply LEDs on the rear of the server. See the Problem Determination and Service Guide for additional information about solving power-supply problems.

Figure 1. 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			Description	Action	Notes
AC	DC	Error (!)
On	On	Off	Normal operation
Off	Off	Off	No ac power to the server or a problem with the ac power source.	Check the ac power to the server. Make sure that the power cord is connected to a functioning power source. Restart the server. If the error remains, check the power-supply LEDs. Replace the power-supply.	This is a normal condition when no ac power is present.
Off	Off	On	No ac power to the server or a problem with the ac power source and the power-supply had detected an internal problem.	Make sure that the power cord is connected to a functioning power source. Replace the power supply.	This happens only when a second power supply is providing power to the server.
Off	On	Off	Faulty power-supply	Replace the power supply.
Off	On	On	Faulty power-supply	Replace the power supply.
On	Off	Off	Power-supply not fully seated, faulty system board, or faulty power-supply	Reseat the power supply. If a power channel error LED on the system board is not lit, replace the power-supply (see the documentation that comes with the power supply for instructions). If a power channel error LED on the system board is lit, (trained service technician only) replace the system board.	Typically indicates a power-supply is not fully seated.
On	Off	On	Faulty power-supply	Replace the power supply.
On	On	On	Power-supply is faulty but still operational	Replace the power supply.