Light path diagnostics

Light path diagnostics is a system of LEDs on various external and internal components of the server.

The light path diagnostics LEDs are on the top of the operator information panel. For additional information about light path diagnostics and LEDs, see Light path diagnostics and Light path diagnostics LEDs.

Note

The system service label on the underside of the cover also provides information about the location of the light path diagnostics LEDs.

To access the light path diagnostics LEDs, press the blue release button on the operator information panel and pull forward on the unit until the hinge of the operator panel is free of the server chassis; then, pull down on the unit so that you can view the light path diagnostics LEDs.

The following illustration shows the LEDs and controls on the light path diagnostics panel.

• Boot code display: This display provides boot error codes that indicate the point at which the system stopped during the boot block and the power-on self-test (POST). A boot code is a byte value that is produced by UEFI. In addition to UEFI codes, this display provides error codes in the event of a microprocessor error or a power fault. Along with the IMM2 event log, the error codes can provide suggested components to be replaced.
• Remind button: This button places the system-error LED on the operator information panel into the Remind mode. In Remind mode, the system-error LED flashes once every 2 seconds until the problem is corrected, the server is restarted, or a new problem occurs.

  By placing the system-error LED indicator in the Remind mode, you acknowledge that you are aware of the last failure but will not take immediate action to correct the problem.

• Reset button: Press this button to reset the server and run the POST. You might have to use a pen or the end of a straightened paper clip to press the button. The Reset button is in the lower-right corner of the light path diagnostics panel.