v
Some
IBM
monitors
have
their
own
self-tests.
If
you
suspect
a
problem
with
the
monitor,
see
the
information
that
comes
with
the
monitor
for
instructions
for
adjusting
and
testing
the
monitor.
If
the
monitor
self-tests
show
that
the
monitor
is
working
correctly,
consider
the
location
of
the
monitor.
Magnetic
fields
around
other
devices
(such
as
transformers,
appliances,
fluorescent
lights,
and
other
monitors)
can
cause
screen
jitter
or
wavy,
unreadable,
rolling,
or
distorted
screen
images.
If
this
happens,
turn
off
the
monitor.
Attention:
Moving
a
color
monitor
while
it
is
turned
on
might
cause
screen
discoloration.
Move
the
device
and
the
monitor
at
least
305
mm
(12
in.)
apart.
Turn
on
the
monitor.
To
prevent
diskette
drive
read/write
errors,
make
sure
that
the
distance
between
the
monitor
and
any
diskette
drive
is
at
least
76
mm
(3
in.).
2.
Check
for
correct
management-module
operation
(see
the
documentation
for
your
BladeCenter
unit).
Note:
Some
BladeCenter
unit
types
have
several
management-module
components
that
might
need
to
be
tested
or
replaced
(see
the
Installation
Guide
for
your
management
module
for
more
information).
3.
Replace
the
monitor
cable,
if
applicable.
4.
Replace
the
monitor.
5.
Replace
the
management
module
(see
the
documentation
for
your
BladeCenter
unit).
If
these
steps
do
not
resolve
the
problem,
it
is
likely
a
problem
with
the
blade
server.
See
“Monitor
or
video
problems”
on
page
29.
Solving
undetermined
problems
Note:
When
you
are
diagnosing
a
problem
in
the
blade
server,
you
must
determine
whether
the
problem
is
in
the
blade
server
or
in
the
BladeCenter
unit.
v
If
all
of
the
blade
servers
have
the
same
symptom,
the
problem
is
probably
in
the
BladeCenter
unit.
For
more
information,
see
the
Hardware
Maintenance
Manual
and
Troubleshooting
Guide
or
Problem
Determination
and
Service
Guide
for
your
BladeCenter
unit.
v
If
the
BladeCenter
unit
contains
more
than
one
blade
server
and
only
one
of
the
blade
servers
has
the
problem,
troubleshoot
the
blade
server
that
has
the
problem.
If
the
diagnostic
tests
did
not
diagnose
the
failure
or
if
the
blade
server
is
inoperative,
use
the
information
in
this
section.
If
you
suspect
that
a
software
problem
is
causing
failures
(continuous
or
intermittent),
see
“Software
problems”
on
page
37.
Damaged
data
in
CMOS
memory
or
damaged
BIOS
code
can
cause
undetermined
problems.
To
reset
the
CMOS
data,
remove
and
replace
the
battery
to
override
the
power-on
password
and
clear
the
CMOS
memory;
see
“Removing
the
battery”
on
page
84.
If
you
suspect
that
the
BIOS
code
is
damaged,
see
“Recovering
from
a
BIOS
update
failure”
on
page
50.
56
BladeCenter
LS21
Type
7971
and
LS41
Type
7972:
Problem
Determination
and
Service
Guide
Summary of Contents for LS21 - BladeCenter - 7971
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