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Power-supply LEDs

This section provides information about the power supply LEDs.

The following minimum configuration is required for the AC 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:

  • One microprocessor in microprocessor socket 1
  • One 4 GB DIMM in a DIMM connector that is associated with microprocessor socket 1 on the system board
  • One power supply
  • Power cord
  • Six cooling fans

The following illustration shows the locations of the power-supply LEDs.

power-supply leds

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.

Table 1. Power-supply LEDs.

A table with six columns and headers with the first row spanned across the first three columns. This table provides information about power-supply LEDs and power-on LEDs and the suggested action to correct the problem.

Power-supply LEDsDescriptionActionNotes
ACDCError
OnOnOffNormal operation The server is functioning correctly.
OffOffOffNo 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.
OffOffOnNo input power to the power supply or the power supply has 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.
OffOnOffFaulty power supplyReplace the power supply. 
OffOnOnFaulty power supplyReplace the power supply. 
OnOffOffThe system is off: The system is connected to ac power. The server is functioning correctly.
   The system is on: Power supply not fully seated, faulty system board, or faulty power supply.
  1. Reseat the power supply.
  2. Replace the power supply.
  3. (Trained service technician only) replace the system board.
Typically indicates a power supply is not fully seated.
OnOffOnFaulty power supplyReplace the power supply. 
OnOnOnFaulty power supplyReplace the power supply.