IBM System x3750 M4 Installation And Service Manual page 189

the operator information panel is free of the server chassis. Then, pull down on
the panel so that you can view the light path diagnostics panel information.
This reveals the light path diagnostics panel. Lit LEDs on this panel indicate
the type of error that has occurred.
The following illustration shows the light path diagnostics panel.
Light Path Diagnostics
Note any LEDs that are lit, and then slide the light path diagnostics panel back
into the server.
v Remind button: Press this button to place the system-error LED on the front
information panel into Remind mode. By placing the system-error LED
indicator in Remind mode, you acknowledge that you are aware of the last
failure but will not take immediate action to correct the problem. In Remind
mode, the system-error LED flashes every 2 seconds until one of the
following conditions occurs:
– All known errors are corrected.
– The server is restarted.
– A new error occurs, causing the system-error LED to be lit again.
v Boot code display: This display provides an error code that indicates the
point at which the system stopped during the boot block and POST. A boot
code is either a byte or a word value that is produced by UEFI. This display
will provide error codes in the event of a microprocessor error or a power
fault. In addition to the IMM log, the codes can provide suggested
components to be replaced. For more information about the error codes
displayed in the boot code display area on the light path diagnostics panel
and the actions to take, see Appendix A, "Boot code display error codes," on
page 331.
v Reset button: Press this button to reset the server and run the power-on
self-test (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.
The system service label inside the server cover provides an overview of
internal components that correspond to the LEDs on the light path diagnostics
panel. This information and the information in "Light path diagnostics LEDs"
on page 174 can often provide enough information to diagnose the error.
3. Remove the server cover and look inside the server for lit LEDs. Certain
components inside the server have LEDs that are lit to indicate the location of a
problem.
Chapter 4. Troubleshooting
171