Lenovo ThinkCentre A52 Hardware Maintenance Manual - Page 50

Problem, determination

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Power LED ON OFF OFF (after the power button has been pressed) ON d. Observe the LEDs and refer to the following table. Green diagnostic LED ON OFF Yellow diagnostic LED Action OFF This is the normal condition of the LEDs when the power is OK. OFF Make sure the power cord is attached to a working electrical outlet. If the electrical outlet is OK, replace the power supply. ON OFF Replace the system board ON ON Replace the power supply If the Diagnostic LEDs are in the normal condition and the problem persists, replace the system board and the microprocessor, one at a time, until the computer works correctly. 8. Run the Diagnostic programs. See Chapter 5, "Diagnostics using PC-Doctor for DOS," on page 47. v If you receive an error, replace the part that the diagnostic program calls out or go to "Diagnostic error codes" on page 59. v If the test stops and you cannot continue, replace the last device tested. Problem determination tips Due to the variety of hardware and software combinations that can be encountered, use the following information to assist you in problem determination. If possible, have this information available when requesting assistance from Service Support and Engineering functions. v Machine type and model v Processor or hard disk upgrades v Failure symptom - Do diagnostics indicate a failure? - What, when, where, single, or multiple systems? - Is the failure repeatable? - Has this configuration ever worked? - If it has been working, what changes were made prior to it failing? - Is this the original reported failure? v Diagnostics version - Type and version level v Hardware configuration - Print (print screen) configuration currently in use - BIOS level v Operating system software - Type and version level Note: To eliminate confusion, identical systems are considered identical only if they: 44 Hardware Maintenance Manual

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d.
Observe
the
LEDs
and
refer
to
the
following
table.
Power
LED
Green
diagnostic
LED
Yellow
diagnostic
LED
Action
ON
ON
OFF
This
is
the
normal
condition
of
the
LEDs
when
the
power
is
OK.
OFF
OFF
OFF
Make
sure
the
power
cord
is
attached
to
a
working
electrical
outlet.
If
the
electrical
outlet
is
OK,
replace
the
power
supply.
OFF
(after
the
power
button
has
been
pressed)
ON
OFF
Replace
the
system
board
ON
ON
ON
Replace
the
power
supply
If
the
Diagnostic
LEDs
are
in
the
normal
condition
and
the
problem
persists,
replace
the
system
board
and
the
microprocessor,
one
at
a
time,
until
the
computer
works
correctly.
8.
Run
the
Diagnostic
programs.
See
Chapter
5,
“Diagnostics
using
PC-Doctor
for
DOS,”
on
page
47.
v
If
you
receive
an
error,
replace
the
part
that
the
diagnostic
program
calls
out
or
go
to
“Diagnostic
error
codes”
on
page
59.
v
If
the
test
stops
and
you
cannot
continue,
replace
the
last
device
tested.
Problem
determination
tips
Due
to
the
variety
of
hardware
and
software
combinations
that
can
be
encountered,
use
the
following
information
to
assist
you
in
problem
determination.
If
possible,
have
this
information
available
when
requesting
assistance
from
Service
Support
and
Engineering
functions.
v
Machine
type
and
model
v
Processor
or
hard
disk
upgrades
v
Failure
symptom
–
Do
diagnostics
indicate
a
failure?
–
What,
when,
where,
single,
or
multiple
systems?
–
Is
the
failure
repeatable?
–
Has
this
configuration
ever
worked?
–
If
it
has
been
working,
what
changes
were
made
prior
to
it
failing?
–
Is
this
the
original
reported
failure?
v
Diagnostics
version
–
Type
and
version
level
v
Hardware
configuration
–
Print
(print
screen)
configuration
currently
in
use
–
BIOS
level
v
Operating
system
software
–
Type
and
version
level
Note:
To
eliminate
confusion,
identical
systems
are
considered
identical
only
if
they:
44
Hardware
Maintenance
Manual