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#### Sun Fire X4640 Server Back Panel LEDs

Number | LED Name | Action and Purpose
--- | --- | ---
1 | PSU fault LED (amber) | Normal state is off. Steady on when the PSU is in a fault state. Used to indicate that service is required. Integral part of server troubleshooting.
2 | Locate LED (white) | Normal state is off. Blinks when activated locally or remotely. Used to identify a server.
3 | Service action required LED (amber) | Normal state is off. Blinks when an internal component is in a fault state. Used to indicate that service is required. Integral part of server troubleshooting.
4 | Power/OK LED (green) | Blinks when the system is in standby power mode. Blinks slowly when system is in POST. On steady when the system finishes POST and is functioning properly in full-power mode.

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