36
Chapter 6. Troubleshooting
The computer does not
return from sleep mode and
the computer does not
work.
•
If yo
u
r comp
ut
er
i
s
in
sleep mode, co
nn
ec
t
t
he AC
adap
t
er
t
o
t
he comp
ut
er,
t
he
n
press a
n
y key or
t
he
power b
utt
o
n
.
•
If
t
he sys
t
em s
ti
ll does
n
o
t
re
tu
r
n
from sleep mode,
yo
u
r sys
t
em has s
t
opped respo
n
d
ing
, a
n
d yo
u
ca
nn
o
t
tu
r
n
off
t
he comp
ut
er; rese
t
t
he comp
ut
er. U
n
saved
da
t
a may be los
t
. To rese
t
t
he comp
ut
er, press a
n
d
hold
t
he power b
utt
o
n
for 4 seco
n
ds or more.
Display panel problems
The screen is blank.
•
Do
t
he follow
ing
:
- If yo
u
are
u
s
ing
t
he AC adap
t
er, or
u
s
ing
t
he
ba
tt
ery, a
n
d
t
he ba
tt
ery s
t
a
tu
s
in
d
i
ca
t
or
i
s o
n
, press
F12
(
)
t
o make
t
he scree
n
br
ig
h
t
er.
- If
t
he power
in
d
i
ca
t
or
i
s
in
bl
in
k
ing
, press
t
he
power b
utt
o
n
t
o res
u
me from
t
he
S
leep mode.
- If
t
he problem pers
i
s
t
s, follow
t
he sol
uti
o
n
in
t
he
n
ex
t
problem “The scree
n
i
s
un
readable or
d
i
s
t
or
t
ed.”
- Press
F9
(
)
t
o co
n
f
i
rm whe
t
her
t
he LCD scree
n
has bee
n
tu
r
n
ed off.
The screen is unreadable or
distorted.
•
Make s
u
re
t
ha
t
:
- The d
i
splay dev
i
ce dr
i
ver
i
s
in
s
t
alled correc
t
ly.
- The scree
n
resol
uti
o
n
a
n
d color q
u
al
it
y are correc
t
ly
se
t
.
- The mo
nit
or
t
ype
i
s correc
t
.
Incorrect characters appear
on the screen.
•
Are
t
he opera
ting
sys
t
em or pro
g
rams
in
s
t
alled
correc
t
ly? If
t
hey are
in
s
t
alled a
n
d co
n
f
igu
red
correc
t
ly, have
t
he comp
ut
er serv
i
ced.
