The following illustration shows the LEDs and controls on the light path
diagnostics panel.
v Remind button: This button places the system-error LED on the front panel into
Remind mode. In Remind mode, the system-error LED flashes every 2 seconds
until the problem is corrected, the system is restarted, or a new problem occurs.
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. The remind function is controlled by the IMM.
v NMI button: Press this button to force a nonmaskable interrupt to the
microprocessor. It allows you to blue screen the server and take a memory
dump (use this button only when directed by the IBM service support).
v Checkpoint code display: This display provides a checkpoint code that indicates
the point at which the system stopped during the boot block and POST. A
checkpoint code is either a byte or a word value that is produced by UEFI. The
display does not provide error codes or suggest components to be replaced.
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-hand corner of the light
path diagnostics panel.
For additional information about the light path diagnostics panel LEDs, see “Light
path diagnostics LEDs” on page 20.
Operator information
panel
Light path
diagnostics LEDs
Release latch
Figure 7. Light path diagnostics panel exposure
Figure 8. Light path diagnostics panel exposure
Chapter 1. The IBM System x3550 M3 server 19
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