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:

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

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

Figure 1. Power-supply LEDs locations

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.
  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. 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
  1. Make sure that the top cover is closed and latched correctly.
  2. Reseat the power supply.
  3. 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.  
Parent topic: Diagnostic tools