Lenovo ThinkCentre A52 Hardware Maintenance Manual - Page 49

General, Checkout - beep codes

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Chapter 4. General Checkout Attention The drives in the computer you are servicing might have been rearranged or the drive startup sequence changed. Be extremely careful during write operations such as copying, saving, or formatting. Data or programs can be overwritten if you select an incorrect drive. General error messages appear if a problem or conflict is found by an application program, the operating system, or both. For an explanation of these messages, refer to the information supplied with that software package. Notes: v The default is for this computer to boot up in quiet mode (no beep, no memory count and checkpoint code display) when no errors are detected by POST. v To enable beep, memory count, and checkpoint code display when a successful POST occurs, do the following: 1. Start the Setup Utility program. See "Starting the Setup Utility program" on page 53. 2. Select Start Options. 3. Set Power-On Self-Test to Enhanced. v Before replacing any FRUs, ensure that the latest level of BIOS is installed on the system. A down-level BIOS might cause false errors and unnecessary replacement of the system board. For more information on how to determine and obtain the latest level BIOS, see "BIOS levels" on page 268. Use the following procedure to help determine the cause of the problem: 1. Power-off the computer and all external devices. 2. Check all cables and power cords. 3. Set all display controls to the middle position. 4. Power-on all external devices. 5. Power-on the computer. v Look for displayed error codes v Listen for beep codes v Look for readable instructions or a main menu on the display. If you did not receive the correct response, proceed to step 6. If you do receive the correct response, proceed to step 8 on page 44. 6. Look at the following conditions and follow the instructions: v If you hear beep codes during POST, go to "Beep symptoms" on page 80. v If the computer displays a POST error, go to "POST error codes" on page 83. v If the computer hangs and no error is displayed, continue at step 7. 7. There are three LEDs to help you determine if the power supply and system board are working correctly. A power button LED is located on the front of the computer and two diagnostic LEDs are located on the power supply at the rear of the computer. a. Disconnect the power cord from the electrical outlet. b. Reconnect the power cord to a working electrical outlet. c. Press the power button. © Lenovo 2005, 2008. Portions © IBM Corp. 2005. 43

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Chapter
4.
General
Checkout
Attention
The
drives
in
the
computer
you
are
servicing
might
have
been
rearranged
or
the
drive
startup
sequence
changed.
Be
extremely
careful
during
write
operations
such
as
copying,
saving,
or
formatting.
Data
or
programs
can
be
overwritten
if
you
select
an
incorrect
drive.
General
error
messages
appear
if
a
problem
or
conflict
is
found
by
an
application
program,
the
operating
system,
or
both.
For
an
explanation
of
these
messages,
refer
to
the
information
supplied
with
that
software
package.
Notes:
v
The
default
is
for
this
computer
to
boot
up
in
quiet
mode
(no
beep,
no
memory
count
and
checkpoint
code
display)
when
no
errors
are
detected
by
POST.
v
To
enable
beep,
memory
count,
and
checkpoint
code
display
when
a
successful
POST
occurs,
do
the
following:
1.
Start
the
Setup
Utility
program.
See
“Starting
the
Setup
Utility
program”
on
page
53.
2.
Select
Start
Options
.
3.
Set
Power-On
Self-Test
to
Enhanced
.
v
Before
replacing
any
FRUs,
ensure
that
the
latest
level
of
BIOS
is
installed
on
the
system.
A
down-level
BIOS
might
cause
false
errors
and
unnecessary
replacement
of
the
system
board.
For
more
information
on
how
to
determine
and
obtain
the
latest
level
BIOS,
see
“BIOS
levels”
on
page
268.
Use
the
following
procedure
to
help
determine
the
cause
of
the
problem:
1.
Power-off
the
computer
and
all
external
devices.
2.
Check
all
cables
and
power
cords.
3.
Set
all
display
controls
to
the
middle
position.
4.
Power-on
all
external
devices.
5.
Power-on
the
computer.
v
Look
for
displayed
error
codes
v
Listen
for
beep
codes
v
Look
for
readable
instructions
or
a
main
menu
on
the
display.
If
you
did
not
receive
the
correct
response,
proceed
to
step
6.
If
you
do
receive
the
correct
response,
proceed
to
step
8
on
page
44.
6.
Look
at
the
following
conditions
and
follow
the
instructions:
v
If
you
hear
beep
codes
during
POST,
go
to
“Beep
symptoms”
on
page
80.
v
If
the
computer
displays
a
POST
error,
go
to
“POST
error
codes”
on
page
83.
v
If
the
computer
hangs
and
no
error
is
displayed,
continue
at
step
7.
7.
There
are
three
LEDs
to
help
you
determine
if
the
power
supply
and
system
board
are
working
correctly.
A
power
button
LED
is
located
on
the
front
of
the
computer
and
two
diagnostic
LEDs
are
located
on
the
power
supply
at
the
rear
of
the
computer.
a.
Disconnect
the
power
cord
from
the
electrical
outlet.
b.
Reconnect
the
power
cord
to
a
working
electrical
outlet.
c.
Press
the
power
button.
©
Lenovo
2005,
2008.
Portions
©
IBM
Corp.
2005.
43