Sun Microsystems Ultra Enterprise 3000, Installation Manual

Page: 41 / 48

Powering the System On and Off 3-7
3
Figure 3-4 System Status LEDs
After boot, check the status of the system by inspecting system status LEDs on
the front panel. See Figure 3-4 and Table 3-1, which summarizes LED status
indications.
Ideally, when self-test completes, both top and bottom LEDs are on. Less ideal
is if all LEDs are on (system needs service, but is able to run). The worst
condition is if the top and middle LEDs are on (system cannot boot), or if no
LED is on.
Table 3-1 Front Panel LED System Status
LED Position Condition
Left LED (green) On — the power supply is delivering DC power
Middle LED
(yellow) On flashing — (first 60 seconds of AC power) self tests are
running
Off — (after self tests end) no hardware failures detected
On — (after self tests end) hardware failure was detected
Right LED
(green) Off — (first 60 seconds of AC power) self tests are running
On flashing — (after self tests end) system is running
Off — (after self tests end) system cannot run; repair is needed
DC power
(green)
Fault (yellow)
System running
(green)