Sun Microsystems Enterprise 250 Owner's Manual page 28

The LEDs consist of two types: system health indicators and fault indicators. The
system health indicators light to show you that the system is functioning normally.
The fault indicators light when a problem is detected in the system. Because it is
important for you to know that a fault exists in the system, the fault indicators
remain lit when the system is reset or switched to standby mode using the
keyswitch.
When you first power on the system, the LEDs are individually toggled on and off to
verify that each one is working correctly. After that, the LEDs operate as described in
the following table.
Name
Power-on
General fault
Activity
Disk fault
Temperature
fault
Power supply
fault
10 Sun Enterprise 250 Server Owner's Guide • June 1998
Icon Description
This green LED lights steadily when the system power
is on and the keyswitch is in the On, Diagnostics, or
Locked position.
This yellow LED blinks slowly while the system runs its
power-on self-test (POST) diagnostics and blinks
rapidly during OpenBoot diagnostic (OBDiag) tests. It
lights steadily when any fault is detected (including a
fault also reported by any other LED).
This green LED blinks continuously to indicate that the
system is operating normally.
This yellow LED lights steadily to indicate a fault in one
of the hard disk drives. When this LED is lit, one or
more disk LEDs may also be lit, indicating the source of
the fault.
This yellow LED lights steadily to indicate an over-
temperature condition in the system.
This yellow LED lights steadily to indicate a power
supply fault. LEDs on the rear of the power supply
indicate the nature of the fault (and identify which
supply is faulty in a system with two supplies).