Sun Microsystems Sun Fire V440 Diagnostics And Troubleshooting Manual page 81

What to Do
1. Check the system LEDs.
There is a group of three LEDs located near the top left corner of the front panel and
duplicated on the back panel. Their status can tell you the following.
LED Name
(location; color)
Locator
(left; white)
Service Required
(middle; amber)
System Activity
(right; green)
The Locator and Service Required LEDs are powered by the system's 5-volt standby
power source and remain lit for any fault condition that results in a system
shutdown.
Note – To view the status of system LEDs from ALOM, type showenvironment
from the sc> prompt.
2. Check the power supply LEDs.
Each power supply has a set of four LEDs located on the front panel and duplicated
on the back panel. Their status can tell you the following.
LED Name
(location; color)
OK-to-Remove
(top; blue)
Indicates
A system administrator can
turn this on to flag a system
that needs attention.
If lit, hardware or software has
detected a problem with the
system.
If blinking, operating system
is in the process of booting.
If off, operating system has
stopped.
Indicates
If lit, power supply can safely
be removed.
Note: Remove a failed power supply only when you are ready
to install its replacement. Both power supplies must remain in
place to ensure proper air circulation and chassis cooling.
Action
Identify a particular system
among many.
Check other LEDs or run
diagnostics to determine the
problem source.
Not applicable.
Action
Remove power supply as
needed.
Chapter 3 Isolating Failed Parts 63