Chapter
2.
Diagnostics
This
chapter
describes
the
diagnostic
tools
that
are
available
to
help
you
solve
problems
that
might
occur
in
the
computer.
If
you
cannot
locate
and
correct
the
problem
using
the
information
in
this
chapter,
see
for
more
information.
Diagnostic
tools
The
following
tools
are
available
to
help
you
diagnose
and
solve
hardware-related
problems:
v
POST
beep
codes
and
error
messages
The
power-on
self-test
(POST)
generates
beep
codes
and
messages
to
indicate
successful
test
completion
or
the
detection
of
a
problem.
See
for
more
information.
v
Troubleshooting
tables
These
tables
list
problem
symptoms
and
actions
to
correct
the
problems.
See
for
more
information.
v
Diagnostic
programs,
messages,
and
error
codes
The
diagnostic
programs
are
the
primary
method
of
testing
the
major
components
of
the
computer.
The
diagnostic
programs
are
stored
on
a
hidden
partition
on
the
hard
disk.
See
for
more
information.
POST
When
you
turn
on
the
computer,
it
performs
a
series
of
tests
to
check
the
operation
of
computer
components
and
some
optional
devices
in
the
computer.
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
prompted,
for
POST
to
run.
If
POST
is
completed
without
detecting
any
problems,
a
single
beep
sounds,
and
the
computer
startup
is
completed.
If
POST
detects
a
problem,
more
than
one
beep
might
sound,
or
an
error
message
is
displayed.
See
and
for
more
information.
POST
beep
codes
A
beep
code
is
a
combination
of
short
and
long
beeps
or
a
series
of
short
beeps
separated
by
pauses.
For
example,
a
“1-2-3”
beep
code
is
one
short
beep,
a
pause,
two
short
beeps,
a
pause,
and
three
short
beeps.
A
beep
code
other
than
one
beep
indicates
that
POST
has
detected
a
problem.
To
determine
the
meaning
of
a
beep
code,
see
If
no
beep
code
sounds,
see
Beep
code
descriptions
The
following
table
describes
the
beep
codes
and
suggested
actions
to
correct
the
detected
problems.
©
Copyright
IBM
Corp.
2005
11
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