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Chapter 10 Isolating Failed Parts 173
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.
The Locator and Fault 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.
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.
3. Check the fan tray LEDs.
There are two LEDs located behind the media door, just under the system control
switch. One LED on the left is for Fan Tray 0 (CPU) and one LED on the right is for
Fan Tray 1 (PCI). If either is lit, it indicates that the corresponding fan tray needs
reseating or replacement.
LED Indicates Action
Locator (left) A system administrator can
turn this on to flag a system
that needs attention.
Identify the system.
Fault (middle) If lit, hardware or software has
detected a problem with the
system.
Check other LEDs or run
diagnostics to determine the
problem source.
Power/OK (right) If off, power is not reaching
the system from the power
supplies.
Check AC power source and
check the power supplies.
LED Indicates Action
OK-to-Remove (top) If lit, power supply can safely
be removed.
Remove power supply as
needed.
Fault (2nd from top) If lit, there is a problem with
the power supply or one of its
internal fans.
Replace the power supply.
DC Present (3rd from
top)
If off, inadequate DC power is
being produced by the supply.
Remove and reseat the power
supply. If this does not help,
replace the supply.
AC Present (bottom) If off, AC power is not
reaching the supply.
Check power cord and the
outlet to which it connects.