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 server to start:
The following illustration shows the LEDs and connectors on the rear of the fixed power-supply model.
Figure 1. LEDs and connectors on the rear of the fixed power-supply model
LEDs and connectors on the rear of the fixed power-supply model
The following illustration shows the LEDs and connectors on the rear of the redundant power-supply model.
Figure 2. LEDs and connectors on the rear of the redundant power-supply model
LEDs and connectors on the rear of the redundant power-supply model

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

Table 1. Power-supply LEDs.

The power-supply LEDs table with two rows of column headings for the AC power-supply LEDs combination of AC, DC, and Error, and one row of column headings for the description, action, and notes.
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.
  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.
On Off Off Faulty system board or faulty power supply
  1. Turn off the server and disconnect the power cord from the server; then, reconnect the power cord.
  2. If the system board error (fault) LED is not lit, replace the power supply.
  3. (Trained technician only) If the system board error LED is lit, replace the system board.
 Typically indicates that a power supply is not fully seated. This is a normal condition before turning on the system.
On Off or Flashing On Faulty power supply Replace the power supply.  
On On On Power supply is faulty but still operational Replace the power supply.  
Parent topic: Diagnostic tools