Skip to main content

System board LEDs

The following illustrations show the light-emitting diodes (LEDs) on the system board.

Figure 1. System board LEDs
System board LEDs
Table 1. System board LEDs
LEDDescription and actions
1 ME heartbeat LED (green)

  • Blinking (about one flash per second): System normal.

  • Off: System fault occurred.

2 CMOS battery error LED (yellow)The system CMOS battery is not installed or is not working.
3 M.2 slot 1 activity LED (green)

  • On: M.2 Slot 1 active.

  • Off: M.2 Slot 1 not active.

4 M.2 slot 2 activity LED (green)

  • On: M.2 Slot 2 active.

  • Off: M.2 Slot 2 not active.

5 P5V_AUX PGOOD LED (green)

  • On: P5V_AUX power is present.

  • Off: P5V_AUX is not ready.

6 FPGA heartbeat LED (green)

  • Blinking (about one flash per second): FPGA is working normally.

  • If FPGA heartbeat LED is always off or always on, do the following:

    1. Replace the processor board.

    2. If the problem remains, contact Lenovo Support.

7 P12V PGOOD LED (green)

Indicates the system is DC on.

8 System power LED (green)

The states of the power LED are as follows:

  • Off: No power supply is properly installed, or the LED itself has failed.

  • Flashing rapidly (four times per second): The server is turned off and is not ready to be turned on. The power-control button is disabled. This will last approximately 5 to 10 seconds.

  • Flashing slowly (once per second): The server is turned off and is ready to be turned on. You can press the power-control button to turn on the server.

  • Lit: The server is turned on.

9 NMI error LED (amber)Indicates that the system had an NMI (Non Maskable Interrupt).
10 Processor mismatch LED (amber)Indicates that processors are not matched.
11 System-board-assembly error LED (yellow)LED on: an error has occurred to the system board assembly. Complete the following steps:

  1. Check the Lenovo XClarity Controller event log and the system error log for information about the error.

  2. Save the log if necessary, and clear the log afterward.

12 DIMM error LEDs (1-32) (amber)

  • LED on: an error has occurred to the DIMM the LED represents.

  • For more information, see Memory problems.

13 Processor 1 error LED (amber)LED on: an error has occurred to the processor the LED represents. Replace the processor.
14 Processor 0 error LED (amber)LED on: an error has occurred to the processor the LED represents. Replace the processor.