Sun Microsystems 6.0005E+11 manual System Front Panel LEDs, Clock Board LEDs

9

9.2.1 System Front Panel LEDs

LEDs in the system are controlled by OpenBoot™ PROM programming (OBP). Table 9-1 lists the LED codes for system operations.

Table 9-1System Status Codes

Power	Service	Cycling
			Condition
Off	Off	Off	No power or the key switch is in the Off position.
Off	On	Off	Failure mode. System has electrical power.
Off	Off	On	Failure mode. System has electrical power.
Off	On	On	Failure mode. System has electrical power.
On	Off	Off	System is hung, either in POST/OBP or in the
			operating system.
On	Off	On	Hung in OS.
On	On	Off	(Hung in POST/OBP) or (hung in OS and failed
			component in system).
On	On	On	(Hung in POST/OBP) or (hung in OS and failed
			component in system).
On	Off	Flashing	OS running. System is operating normally.
On	On	Flashing	OS running and failed component in system.
On	Flashing	Off	Slow flash = POST. Fast flash = OBP.
On	Flashing	On	OS or OBP error.

9.2.2 Clock Board LEDs

The clock board also displays system status. The LED codes are the same as for the front panel. See Table 9-1.

9.2.3 CPU/Memory and I/O Board LEDs

For hot-pluggable boards, most of the LED codes correspond to those shown in Table 9-1. The most important exception is the second code (Off-On-Off). For hot-pluggable boards, Off-On-Off indicates that the board is in low-power mode and is ready for removal.

Troubleshooting Overview 9-3