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System-board LEDs

The following illustration shows the location of light path diagnostic LEDs and light path diagnostic switch on the system board. These LEDs can often identify the source of an error.

Press the light path diagnostic switch 3 to turn on the system board LEDs for a limited amount of time when the system board is removed from the chassis.
Figure 1. System-board light path LEDs
System-board LEDs
Table 1. Light path diagnostics: System-board LED status and actions
LEDDescriptionAction
1 Processor 2 error LEDLED on: An error has occurred with processor 2.

See Processor problems

2 System board error LEDLED on: An error has occurred on the system board.

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.

3 Light path diagnostic switchPress the light path diagnostic switch to turn on the system board LEDs. 
4 Processor 1 error LEDLED on: An error has occurred with processor 1.

See Processor problems

5 Memory module 1 through 24 error LEDsLED on: An error has occurred with the designated memory module.See Memory problems