Skip to main content

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:
  • One microprocessor
  • One 1 GB DIMM
  • Power supply
  • Power cord
  • One cooling fan

The following illustrations show the LEDs and connectors on the rear of the respective 4U and 5U server models.

Figure 1. LEDs and connectors on the rear of the 4U server model with non-hot-swap power supplies (no power supply LEDs present)
LEDs and connectors on the rear of the 4U server model with non-hot-swap power supplies (no power supply LEDs present)
Figure 2. LEDs and connectors on the rear of the 4U server model with non-hot-swap power supplies (power supply LEDs present)
LEDs and connectors on the rear of the 4U server model with non-hot-swap power supplies (power supply LEDs present)
Figure 3. LEDs and connectors on the rear of the 5U server model with hot-swap power supplies
LEDs and connectors on the rear of the 5U server model with hot-swap power supplies

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 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. If the problem remains, replace the power-supply.
This is a normal condition when no ac power is present.
OnOffOffFaulty 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.
OnOff or FlashingOnFaulty power supplyReplace the power supply. 
OnOnOffNormal operation  
OnOnOnPower supply is faulty but still operationalReplace the power supply.