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

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Sun Microsystems 6.0005E+11 manual System Front Panel LEDs, Clock Board LEDs, 3 CPU/Memory and I/O Board LEDs