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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
“Numeric
error
codes”
on
page
58.
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
(IBM
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.
The
DOS
full
screen
looks
smaller
than
it
should.
Start
the
ThinkPad
Configuration
program
and
set
the
Screen
expansion
function.
Symptom-to-FRU
index
64
MT
2373/2374/2375/2376/2378/2379