IBM 8658 User Guide - Page 23

Diagnostics - type

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Diagnostics This section provides basic troubleshooting information to help you resolve some common problems that might occur with your server. Diagnostic tools overview The following tools are available to help you identify and resolve 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 error codes" on page 135 for more information. v Light path diagnostics Your server has light-emitting diodes (LEDs) to help you identify problems with server components. These LEDs are part of the light-path diagnostics that are built into your server. By following the path of lights, you can quickly identify the type of system error that occurred. See "Light path diagnostics" on page 14 and the table in "Information panel system error LED" on page 128 for more information. v Diagnostic programs and error messages The server diagnostic programs are stored in upgradable read-only memory (ROM) on the system board. These programs are the primary method of testing the major components of your server. See "Diagnostic programs and error messages" on page 15 for more information. POST When you turn on the server, it performs a series of tests to check the operation of server components and some of the options installed in the server. This series of tests is called the power-on self-test or POST. If POST finishes without detecting any problems, a single beep sounds, the first screen of your operating system or application program appears, and the System POST Complete (OK) light is illuminated on the operator information panel. If POST detects a problem, more than one beep sounds and an error message appears on your screen. See "Beep Symptoms" on page 125 and "POST error codes" on page 135 for more information. Notes: 1. If you have a power-on password or administrator password set, you must type the password and press Enter, when prompted, before POST will continue. 2. A single problem might cause several error messages. When this occurs, work to correct the cause of the first error message. After you correct the cause of the first error message, the other error messages usually will not occur the next time you run the test. Event/error logs The POST error log contains the three most recent error codes and messages that the system generated during POST. The System Event/Error Log contains all error © Copyright IBM Corp. 2000 13

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Diagnostics
This
section
provides
basic
troubleshooting
information
to
help
you
resolve
some
common
problems
that
might
occur
with
your
server.
Diagnostic
tools
overview
The
following
tools
are
available
to
help
you
identify
and
resolve
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
error
codes”
on
page
135
for
more
information.
v
Light
path
diagnostics
Your
server
has
light-emitting
diodes
(LEDs)
to
help
you
identify
problems
with
server
components.
These
LEDs
are
part
of
the
light-path
diagnostics
that
are
built
into
your
server.
By
following
the
path
of
lights,
you
can
quickly
identify
the
type
of
system
error
that
occurred.
See
“Light
path
diagnostics”
on
page
14
and
the
table
in
“Information
panel
system
error
LED”
on
page
128
for
more
information.
v
Diagnostic
programs
and
error
messages
The
server
diagnostic
programs
are
stored
in
upgradable
read-only
memory
(ROM)
on
the
system
board.
These
programs
are
the
primary
method
of
testing
the
major
components
of
your
server.
See
“Diagnostic
programs
and
error
messages”
on
page
15
for
more
information.
POST
When
you
turn
on
the
server,
it
performs
a
series
of
tests
to
check
the
operation
of
server
components
and
some
of
the
options
installed
in
the
server.
This
series
of
tests
is
called
the
power-on
self-test
or
POST.
If
POST
finishes
without
detecting
any
problems,
a
single
beep
sounds,
the
first
screen
of
your
operating
system
or
application
program
appears,
and
the
System
POST
Complete
(OK)
light
is
illuminated
on
the
operator
information
panel.
If
POST
detects
a
problem,
more
than
one
beep
sounds
and
an
error
message
appears
on
your
screen.
See
“Beep
Symptoms”
on
page
125
and
“POST
error
codes”
on
page
135
for
more
information.
Notes:
1.
If
you
have
a
power-on
password
or
administrator
password
set,
you
must
type
the
password
and
press
Enter,
when
prompted,
before
POST
will
continue.
2.
A
single
problem
might
cause
several
error
messages.
When
this
occurs,
work
to
correct
the
cause
of
the
first
error
message.
After
you
correct
the
cause
of
the
first
error
message,
the
other
error
messages
usually
will
not
occur
the
next
time
you
run
the
test.
Event/error
logs
The
POST
error
log
contains
the
three
most
recent
error
codes
and
messages
that
the
system
generated
during
POST.
The
System
Event/Error
Log
contains
all
error
©
Copyright
IBM
Corp.
2000
13