Light path diagnostics
Light path diagnostics is a system of LEDs on various external and internal components of the server that
leads you to the failed component. When an error occurs, LEDs are lit on the front I/O assembly, the rear
panel, the system board, and the failed component. By viewing the following LEDs, you can often identify the
system and device status and diagnose problems.
• “Front IO assembly” on page 27
• “LCD diagnostics panel” on page 29
• “Rear view LEDs” on page 52
• “System board LEDs” on page 56
Chapter 5. Problem determination 385
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