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Power-supply LEDs

This section shows the power-supply LEDs on the server.

The following illustration shows the location of the power-supply LEDs (redundant power supplies) on the rear of the server.

The following illustration shows the location of the power-supply LEDs (fixed power supplies) on the rear of the server.

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

  • Power supply
  • Power cord
Note
You must turn on the server for the DC LED on the power supply to be lit.

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
  • 2 cooling fans (fan 2 and rear fan)

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 LEDsDescriptionActionNotes
ACDCError (!)
OnOnOffNormal operation  
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.
OffOffOnFaulty power-supplyReplace the power supply. 
OffOnOffFaulty power-supplyReplace the power supply. 
OffOnOnFaulty power-supplyReplace the power supply. 
OnOffOffPower supply not fully seated, faulty system board, faulty power supply, or system not power-on
  1. Reseat the power supply.
  2. Use the Power Configurator utility to determine current system power consumption. For more information and to download the utility, go to the IBM Power Configurator for System x, BladeCenter, and Flex System website.
  3. For hot-swap power-supply systems, follow actions listed in Power problems andSolving power problems.
Typically indicates a power-supply is not fully seated.
OnOffOnFaulty power-supplyReplace the power supply. 
OnOnOnFaulty power-supplyReplace the power supply.