IBM MT 9441 User Manual
Beep
symptoms
Symptom
or
error
FRU
or
action,
in
sequence
One
beep
and
a
blank,
unreadable,
or
flashing
LCD.
1.
Reseat
the
LCD
connector
.
2.
LCD
assembly.
3.
External
CRT.
4.
System
board.
One
long
and
two
short
beeps,
and
a
blank
or
unreadable
LCD.
1.
System
board
.
2.
LCD
assembly.
3.
DIMM.
Two
short
beeps
with
error
codes.
POST
error.
See
Two
short
beeps
and
a
blank
screen.
1.
System
board
.
2.
DIMM.
Three
short
beeps,
pause,
three
more
short
beeps,
and
one
short
beep.
1.
DIMM
.
2.
System
board
One
short
beep,
pause,
three
short
beeps,
pause,
three
more
short
beeps,
and
one
short
beep.
Only
the
cursor
appears.
Reinstall
the
operating
system
.
Four
cycles
of
four
short
beeps
and
a
blank
screen.
System
board
(security
chip)
Five
short
beeps
and
a
blank
screen.
System
board
No-beep
symptoms
Symptom
or
error
FRU
or
action,
in
sequence
No
beep,
power-on
indicator
on,
LCD
blank,
and
no
POST.
1.
Make
sure
that
every
connector
is
connected
tightly
and
correctly
.
2.
DIMM.
3.
System
board.
No
beep,
power-on
indicator
on,
and
LCD
blank
during
POST.
1.
Reseat
DIMM
.
2.
System
board.
The
power-on
password
prompt
appears.
A
power-on
password
or
a
supervisor
password
is
set.
Type
the
password
and
press
Enter
.
The
hard-disk
password
prompt
appears.
A
hard-disk
password
is
set.
Type
the
password
and
press
Enter
.
LCD-related
symptoms
Important:
The
TFT
LCD
for
the
notebook
computer
contains
many
thin-film
transistors
(TFTs).
The
presence
of
a
small
number
of
dots
that
are
missing,
discolored,
or
always
lighted
is
characteristic
of
TFT
LCD
technology,
but
excessive
pixel
problems
can
cause
viewing
concerns.
The
LCD
should
be
replaced
if
the
number
of
missing,
discolored,
or
lighted
dots
in
any
background
is
as
follows:
Minimum
quantity
of
defective
pixels
required
for
LCD
replacement
on
June
2006
or
later
manufactured
ThinkPad
Symptom-to-FRU
index
ThinkPad
Z61t
49