Power-supply LEDs

This section describes the power-supply LEDs on the rear of the server and the suggested actions to correct the detected problems.

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

• Power supply
• Power cord

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

• One microprocessor in microprocessor socket 1
• One 2 GB DIMM (per microprocessor) on the system board
• One power supply
• Power cord
• Four cooling fans

The following illustrations show the locations of the power-supply LEDs for fixed and redundant models respectively.

Figure 1. Power-supply LEDs locations

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

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	Make sure that the top cover is closed and latched correctly. Reseat the power supply. Replace the failing power supply.	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	Replace the power supply.