remind
mode,
the
system-error
LED
on
the
front
of
the
server
flashes.
If
a
new
failure
occurs,
the
system-error
LED
is
lit
again.
Press
the
reset
button
to
reset
the
server
and
run
the
power-on
self-test
(POST).
You
might
have
to
use
a
pen
or
the
end
of
a
straightened
paper
clip
to
press
the
button.
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.
Diagnosing
problems
using
light
path
diagnostics
LEDs
in
two
locations
on
the
server
are
available
to
help
you
diagnose
problems
that
might
occur
during
installation.
Use
them
in
the
following
order:
1.
Light
path
diagnostics
panel
–
Look
at
this
panel
first.
If
a
system
error
has
occurred,
the
system-error
LED
on
the
front
of
the
light
path
diagnostics
drawer
is
lit.
Slide
the
latch
to
the
left
on
the
front
of
the
light
path
diagnostics
drawer
to
access
the
light
path
diagnostics
panel.
Note
any
LEDs
that
are
lit,
and
then
close
the
drawer.
2.
LEDs
on
the
system
board
–
To
identify
the
component
that
is
causing
the
error,
note
the
lit
LED
on
or
beside
the
component.
Light
path
diagnostics
LEDs
For
a
complete
list
of
the
LEDs
on
the
light
path
diagnostics
panel,
the
problems
they
indicate,
and
actions
to
solve
the
problems
see
“Light
path
diagnostics
LEDs”
on
page
83.
Recovering
the
BIOS
code
If
the
BIOS
code
has
become
damaged,
such
as
from
a
power
failure
during
a
flash
update,
you
can
recover
the
BIOS
code
using
the
boot
block
jumper
and
a
BIOS
recovery
diskette.
Note:
You
can
obtain
a
BIOS
recovery
diskette
from
one
of
the
following
sources:
v
Use
the
ServerGuide
Setup
and
Installation
CD
to
make
a
BIOS
recovery
diskette.
v
Download
a
BIOS
recovery
diskette
from
the
World
Wide
Web.
Go
to
http://www.ibm.com/support/,
click
IBM
Server
Support
,
and
make
the
selections
for
your
server.
v
Contact
your
IBM
service
representative.
The
flash
memory
of
your
server
contains
a
protected
area
that
cannot
be
overwritten.
The
recovery
boot
block
is
a
section
of
code
in
this
protected
area
that
enables
the
server
to
start
up
and
to
read
a
recovery
diskette.
The
recovery
utility
recovers
the
system
BIOS
code
from
the
BIOS
recovery
files
on
the
diskette.
Complete
the
following
steps
to
recover
the
BIOS
code:
1.
Turn
off
the
server,
and
disconnect
all
power
cords
and
external
cables.
2.
Remove
the
server
cover.
See
“Removing
the
cover”
on
page
16
for
more
information.
3.
Locate
the
flash
boot
block
recovery
jumper
block
(J60)
on
the
system
board.
68
xSeries
346
Types
8840
and
1880:
Hardware
Maintenance
Manual
and
Troubleshooting
Guide
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