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Power supply LEDs

This topic provides information about various power supply LED status and corresponding action suggestions.

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

  • One processor
  • One memory module in slot 7
  • One power supply
  • One HDD/SSD drive or one M.2 drive (if OS is needed for debugging)
  • Five system fans

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

Depending on the power supply type, your power supply might look slightly different from the following illustration.
Figure 1. Power supply LEDs
Power supply LEDs
1 Input status
The input status LED can be in one of the following states:
  • Green: The power supply is connected to the input power source.

  • Off: The power supply is disconnected from the input power source.

2 Output status
The output status LED can be in one of the following states:
  • Off: The server is powered off, or the power supply is not working properly. If the server is powered on but the output status LED is off, replace the power supply.

  • Slow blinking green (about one flash every two seconds): The power supply is in cold redundancy active mode.

  • Fast blinking green (about 2 flashes each second): The power supply is in cold redundancy sleep mode.

  • Green: The server is on and the power supply is working normally.

Zero-output mode can be disabled via Setup utility or Lenovo XClarity Controller web interface. If you disable zero-output mode, both power supplies will be in the active state.
  • Log in to the Lenovo XClarity Controller web interface, choose Server Configuration > Power Policy, disable Zero Output Mode, and then click Apply.

3 Power supply error LED
  • Off: The power supply is working normally.

  • Amber: The power supply may have failed. Dump the FFDC log from the system and contact Lenovo back end support team for PSU data log reviewing.