Lenovo ThinkCentre M50 Hardware Maintenance Manual (HMM) - Page 18

Computer, Power-on, Beeps, Powering, Anything, Displayed, Monitor, Screen?, Receive, Expected,

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001 1. Power-off the computer and all external devices. 2. Make sure that all external cables and power cords are properly connected. 3. Remove the cover and make sure that all cables to the system board are seated properly. 4. Set all monitor controls to the middle position. 5. Power-on all external devices. 6. Power-on the computer. 7. Check the power-on indicator and listen for the fan(s). DID THE COMPUTER POWER-ON AND STAY ON? YES, continue to 002 . NO, go to "Undetermined problems" on page 109. 002 DID YOU HEAR ANY BEEPS WHEN POWERING ON? YES, go to "Beep symptoms" on page 89. NO, continue to 003 . 003 IS ANYTHING DISPLAYED ON THE MONITOR SCREEN? YES, continue to 004 . NO, make sure that the monitor is working properly. Most monitors have some sort of diagnostic self test. Refer to the manual for your monitor. If you determine that the monitor is working properly, make sure it is properly connected to the computer. Otherwise, go to "Undetermined problems" on page 109. 004 DID YOU RECEIVE THE EXPECTED RESPONSE? YES, continue to 005 . NO, proceed to 006 . 005 Run the Diagnostic programs. If necessary, refer to Chapter 4, "IBM Enhanced Diagnostics," on page 15. v If you receive an error, replace the part that the diagnostic program calls out or go to Chapter 7, "Symptom-to-FRU Index," on page 69. v If an installed device is not recognized by the diagnostics program, that device might be defective. 12 Hardware Maintenance Manual

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±001²
1.
Power-off
the
computer
and
all
external
devices.
2.
Make
sure
that
all
external
cables
and
power
cords
are
properly
connected.
3.
Remove
the
cover
and
make
sure
that
all
cables
to
the
system
board
are
seated
properly.
4.
Set
all
monitor
controls
to
the
middle
position.
5.
Power-on
all
external
devices.
6.
Power-on
the
computer.
7.
Check
the
power-on
indicator
and
listen
for
the
fan(s).
DID
THE
COMPUTER
POWER-ON
AND
STAY
ON?
YES,
continue
to
±002²
.
NO,
go
to
“Undetermined
problems”
on
page
109.
±002²
DID
YOU
HEAR
ANY
BEEPS
WHEN
POWERING
ON?
YES,
go
to
“Beep
symptoms”
on
page
89.
NO,
continue
to
±003²
.
±003²
IS
ANYTHING
DISPLAYED
ON
THE
MONITOR
SCREEN?
YES,
continue
to
±004²
.
NO,
make
sure
that
the
monitor
is
working
properly.
Most
monitors
have
some
sort
of
diagnostic
self
test.
Refer
to
the
manual
for
your
monitor.
If
you
determine
that
the
monitor
is
working
properly,
make
sure
it
is
properly
connected
to
the
computer.
Otherwise,
go
to
“Undetermined
problems”
on
page
109.
±004²
DID
YOU
RECEIVE
THE
EXPECTED
RESPONSE?
YES,
continue
to
±005²
.
NO,
proceed
to
±006²
.
±005²
Run
the
Diagnostic
programs.
If
necessary,
refer
to
Chapter
4,
“IBM
Enhanced
Diagnostics,”
on
page
15.
v
If
you
receive
an
error,
replace
the
part
that
the
diagnostic
program
calls
out
or
go
to
Chapter
7,
“Symptom-to-FRU
Index,”
on
page
69.
v
If
an
installed
device
is
not
recognized
by
the
diagnostics
program,
that
device
might
be
defective.
12
Hardware
Maintenance
Manual