keyboard,
mouse
(pointing
device),
serial
ports,
and
hard
disk
drives.
You
can
also
use
them
to
test
some
external
devices.
If
you
are
not
sure
whether
a
problem
is
caused
by
the
hardware
or
by
the
software,
you
can
use
the
diagnostics
programs
to
confirm
that
the
hardware
is
working
correctly.
v
When
you
run
the
diagnostics
programs,
a
single
problem
might
cause
several
error
messages.
If
you
receive
several
error
messages,
correct
the
cause
of
the
first
error
message.
The
other
error
messages
might
not
occur
the
next
time
you
run
the
diagnostics
programs.
v
Before
running
the
diagnostics
programs,
you
must
determine
whether
the
failing
server
is
part
of
a
shared
hard
disk
drive
cluster
(two
or
more
servers
sharing
external
storage
devices).
If
it
is
part
of
a
cluster,
you
can
run
all
diagnostics
programs
except
the
ones
that
test
the
storage
unit
(that
is,
a
hard
disk
drive
in
the
storage
unit)
or
the
storage
adapter
that
is
attached
to
the
storage
unit.
The
failing
server
might
be
part
of
a
cluster
if
any
of
the
following
conditions
is
true:
–
You
have
identified
the
failing
server
as
part
of
a
cluster
(two
or
more
servers
sharing
external
storage
devices).
–
One
or
more
external
storage
units
are
attached
to
the
failing
server
and
at
least
one
of
the
attached
storage
units
is
also
attached
to
another
server
or
unidentifiable
device.
–
One
or
more
servers
are
located
near
the
failing
server.
Important:
If
the
server
is
part
of
a
shared
hard
disk
drive
cluster,
run
one
test
at
a
time.
Do
not
run
any
suite
of
tests,
such
as
“quick”
or
“normal”
tests,
because
this
might
enable
the
hard
disk
drive
diagnostic
tests.
v
If
the
server
is
suspended
and
a
POST
error
code
is
displayed,
see
“Error
logs”
on
page
70.
If
the
server
is
suspended
and
no
error
message
is
displayed,
see
“Problem
isolation
tables”
on
page
88
and
“Solving
undetermined
problems”
on
page
156.
v
For
information
about
power-supply
problems,
see
“Solving
power
problems”
on
page
155
and
“Power-supply
LEDs”
on
page
108.
v
For
intermittent
problems,
check
the
error
log;
see
“Error
logs”
on
page
70
and
“Diagnostic
programs,
messages,
and
error
codes”
on
page
110.
Performing
the
checkout
procedure
To
perform
the
checkout
procedure,
complete
the
following
steps:
001
IS
THE
SERVER
PART
OF
A
CLUSTER?
002
No.
Go
to
step
004
.
003
Yes.
Schedule
maintenance.
Shut
down
all
failing
systems
that
are
related
to
the
cluster.
Go
to
step
004
.
004
v
Check
the
power
supply
LEDs,
see
“Power-supply
LEDs”
on
page
108.
v
Turn
off
the
server
and
all
external
devices.
v
Check
all
internal
and
external
devices
for
compatibility
at
http://www.ibm.com/servers/eserver/serverproven/compat/us/.
v
Check
all
cables
and
power
cords.
v
Set
all
display
controls
to
the
middle
positions.
v
Turn
on
all
external
devices.
v
Turn
on
the
server.
Chapter
5.
Diagnostics
87
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