The
server
is
designed
so
that
LEDs
remain
lit
when
the
server
is
connected
to
an
ac
power
source
but
is
not
turned
on,
provided
that
the
power
supply
is
operating
correctly.
This
feature
helps
you
to
isolate
the
problem
when
the
operating
system
is
shut
down.
Any
memory,
microprocessor,
or
VRM
LED
can
be
lit
again
without
ac
power
after
you
remove
the
microprocessor
tray
so
that
you
can
isolate
a
problem.
After
ac
power
has
been
removed
from
the
server,
power
remains
available
to
these
LEDs
for
up
to
24
hours.
To
view
the
memory,
microprocessor,
or
VRM
LEDs,
press
and
hold
the
light
path
diagnostics
button
on
the
memory
card
or
on
the
microprocessor
board
briefly
to
light
the
error
LEDs.
The
LEDs
that
were
lit
while
the
server
was
running
will
be
lit
again
while
the
button
is
pressed.
Many
errors
are
first
indicated
by
a
lit
information
LED
or
system-error
LED
on
the
operator
information
panel
on
the
front
of
the
server.
If
one
or
both
of
these
LEDs
are
lit,
one
or
more
LEDs
elsewhere
in
the
server
might
also
be
lit
and
can
direct
you
to
the
source
of
the
error.
Before
working
inside
the
server
to
view
light
path
diagnostics
LEDs,
read
the
safety
information
that
begins
on
page
v
and
If
an
error
occurs,
view
the
light
path
diagnostics
LEDs
in
the
following
order:
1.
Check
the
operator
information
panel
on
the
front
of
the
server.
v
If
the
information
LED
is
lit,
it
indicates
that
information
about
a
suboptimal
condition
in
the
server
is
available
in
the
BMC
log
or
in
the
system-error
log.
v
If
the
system-error
LED
is
lit,
it
indicates
that
an
error
has
occurred;
go
to
step
The
following
illustration
shows
the
operator
information
panel.
Power-control button
Power-on LED
USB connector
Hard disk drive activity LED
Information LED
System-error LED
Locator LED
Release latch
2.
Unlock
the
front
cover
(tower
model
only)
and
remove
the
server
cover
to
look
inside
the
server
for
lit
LEDs.
Certain
components
inside
the
server
have
LEDs
that
will
be
lit
to
indicate
the
location
of
a
problem.
For
example,
a
VRM
error
will
light
the
LED
next
to
the
failing
VRM
on
the
microprocessor
tray.
The
following
illustration
shows
the
LEDs
and
connectors
on
the
microprocessor
tray.
Chapter
5.
Solving
problems
51
