Power supply LEDs

Figure 1. AC power-supply LEDs
AC power-supply LEDs
1 AC power LED (green) 3 Power supply error LED (yellow)
2 DC power LED (green)  

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

AC power-supply LEDs Description Action Notes
AC DC Error (!)
On On/ Blinking Off Normal operation.   When the DC LED is blinking as a 1Hz rate, the PSU is at Zero-Output mode, i.e. no DC power output from this PSU
Off Off Off No AC power to the solution or a problem with the AC power source.
  1. Check the AC power to the solution.

  2. Make sure that the power cord is connected to a functioning power source.

  3. Restart the solution. 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.
Off Off On The power supply has failed. Replace the power supply.  
Off On/ Blinking Off The power supply has failed. Replace the power supply.  
Off On/ Blinking On The power supply has failed. Replace the power supply.  
On Off Off Power-supply not fully seated, faulty system board, or the power supply has failed.
  1. Reseat the power supply.

  2. Use the Power Configurator utility to ensure current system power consumption is under limitation.

  3. Check the error LEDs on the system board and the Lenovo XClarity Controller error messages.

Typically indicates a power-supply is not fully seated.
On Off On The power supply has failed. Replace the power supply.  
On On/ Blinking On The power supply has failed. Replace the power supply.