Chapter
2.
Diagnostics
This
chapter
describes
the
diagnostic
tools
that
are
available
to
help
you
solve
problems
that
might
occur
in
the
server.
If
you
cannot
diagnose
and
correct
the
problem
by
using
the
information
in
this
chapter,
see
Appendix
A,
“Getting
help
and
technical
assistance,”
on
page
97
for
more
information.
Diagnostic
tools
The
following
tools
are
available
to
help
you
diagnose
and
solve
hardware-related
problems:
v
POST
beep
codes,
error
messages,
and
error
logs
The
power-on
self-test
(POST)
generates
beep
codes
and
messages
to
indicate
successful
test
completion
or
the
detection
of
a
problem.
See
“POST”
for
more
information.
v
Troubleshooting
tables
These
tables
list
problem
symptoms
and
actions
to
correct
the
problems.
See
“Troubleshooting
tables”
on
page
28.
v
System-board
error
LEDs
When
the
system-error
LED
on
the
front
of
the
server
is
lit,
an
LED
on
the
system
board
might
also
be
lit
to
help
isolate
an
error.
See
“System-board
LEDs”
on
page
10
for
more
information.
v
Diagnostic
programs,
messages,
and
error
messages
The
diagnostic
programs
are
the
primary
method
of
testing
the
major
components
of
the
server.
The
diagnostic
programs
are
on
the
IBM
Enhanced
Diagnostics
CD.
See
“Diagnostic
programs,
messages,
and
error
codes”
on
page
40
for
more
information.
POST
When
you
turn
on
the
server,
it
performs
a
series
of
tests
to
check
the
operation
of
the
server
components
and
some
optional
devices
in
the
server.
This
series
of
tests
is
called
the
power-on
self-test,
or
POST.
If
a
power-on
password
is
set,
you
must
type
the
password
and
press
Enter,
when
you
are
prompted,
for
POST
to
run.
If
POST
is
completed
without
detecting
any
problems,
a
single
beep
sounds,
and
the
server
startup
is
completed.
If
POST
detects
a
problem,
several
beeps
might
sound,
or
an
error
message
is
displayed.
See
“POST
beep
codes”
and
“POST
error
codes”
on
page
16
for
more
information.
POST
beep
codes
A
beep
code
is
a
combination
of
short
or
long
beeps
or
series
of
short
beeps
that
are
separated
by
pauses.
For
example,
a
“1-2-3”
beep
code
is
one
short
beep,
a
pause,
two
short
beeps,
and
pause,
and
three
short
beeps.
A
beep
code
indicates
that
POST
has
detected
a
problem.
To
determine
the
meaning
of
a
beep
code,
see
“Beep
code
descriptions”
on
page
14.
©
Copyright
IBM
Corp.
2007
13
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