IBM x3690 X5 Service Manual page 87

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 corner
of the light path diagnostics panel.
Look at the system service label inside the server cover, which gives 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 70 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.
The following illustration shows the LEDs and connectors on the system board.
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Chapter 3. Diagnostics