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Error LEDs

This section describes the error LEDs on the system board and the suggested actions to correct the detected problems.

The system board has error LEDs that will help to locate the source of the error. Run the diagnostic programs to find out the cause of the error. See Dynamic System Analysis.

The server is designed so that LEDs remain lit when the server is connected to an ac power source but is not turned on, provided that the power supply is operating correctly. This feature helps you to isolate the problem when the operating system is shut down.

Note
When you disconnect the power source from the server, you lose the ability to view the LEDs because the LEDs are not lit when the power source is removed. Before you disconnect the power source, make a note of which LEDs are lit, including the LEDs that are lit on the operation information panel and LEDs inside the server on the system board.

Many errors are first indicated by the lit system-error LED on the operator information panel of the server. If this LED is lit, one or more LEDs elsewhere in the server might also be lit and can direct you to the source of the error.

Before you work inside the server to view the LEDs, read the Safety and Handling static-sensitive devices.

If an error occurs or you suspect a system error, do the following:
  1. Check the operator information panel on the front of the server. If the system-error LED is lit, it confirms that an error has occurred.
  2. Check the IMM2.1 event log and the system-error log for information about the error.
  3. Look at the system service label inside the cover of the server, which gives an overview of internal components. This label also usually includes helpful instructions to help you correct the error.

For the locations of the error LEDs, see System-board LEDs.

The following table describes the LEDs on the system board and suggested actions to correct the detected problems:

  • IMM2.1 heartbeat LED: When the server is connected to power, this LED flashes quickly to indicate that the IMM2.1 code is loading. When the loading is completed, the LED stops flashing quickly and then flashes slowly, which means that the IMM2.1 if fully operational and you can press the power-control button to start the server.

    If the LED does not begin flashing within 30 seconds after the server is connected to power, do the following:
    1. (Trained technician only) Recover the firmware. See Recovering the server firmware (UEFI update failure).
    2. (Trained technician only) Replace the system board.

  • System-error LED: When the LED is lit, it indicates that the microprocessor VRD and/or power voltage regulators have failed. Then, you need to ask trained technician to replace the system board.

  • CPLD heartbeat LED: If the LED flashes at 1 Hz, it is functioning properly and no action is necessary. If the LED is not flashing, replace the system board (Trained technician only).