Lenovo ThinkPad T42 (Greek) Service and Troubleshooting guide for the ThinkPad - Page 44

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Solving computer problems Solution: Make sure that: v The battery is charged. v The operating temperature is within the acceptable range. Refer to "Specifications" on page 5. If these items are correct, have the computer serviced. Problem: The critical low-battery error message is displayed, and the computer immediately turns off. Solution: The battery power is getting low. Connect the ac adapter to the computer, or replace the battery with a fully charged one. Problem: When you take action to return from standby mode, the computer display remains blank. Solution: Check whether an external monitor was disconnected while the computer was in standby mode. Do not disconnect the external monitor while the computer is in standby mode or hibernation mode. If no external monitor is attached when the computer resumes, the computer display remains blank and output is not displayed. This restriction does not depend on the resolution value. Press Fn+F7 to bring up the computer display. Note: If you use the Fn+F7 key combination to apply a presentation scheme, press Fn+F7 at least three times in three seconds, and the image is displayed on the computer screen. Problem: The computer does not return from standby mode, or the standby indicator stays on and the computer does not work. Solution: If the system does not return from standby mode, it may have entered standby or hibernation mode automatically because the battery is depleted. Check the standby indicator. v If the standby indicator is on, your computer is in standby mode. Connect the ac adapter to the computer; then press Fn. v If the standby indicator is off, your computer is in hibernation mode or power-off state. Connect the ac adapter to the computer; then press power button to resume operation. If the system still does not return from standby mode, your system may stop responding and you cannot turn off the computer. In this case, you need to reset the computer. If you have not saved your data, it may be 22 ThinkPad® T40 Series Service and Troubleshooting Guide

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Solution:
Make
sure
that:
v
The
battery
is
charged.
v
The
operating
temperature
is
within
the
acceptable
range.
Refer
to
“
Specifications
”
on
page
5.
If
these
items
are
correct,
have
the
computer
serviced.
Problem:
The
critical
low-battery
error
message
is
displayed,
and
the
computer
immediately
turns
off.
Solution:
The
battery
power
is
getting
low.
Connect
the
ac
adapter
to
the
computer,
or
replace
the
battery
with
a
fully
charged
one.
Problem:
When
you
take
action
to
return
from
standby
mode,
the
computer
display
remains
blank.
Solution:
Check
whether
an
external
monitor
was
disconnected
while
the
computer
was
in
standby
mode.
Do
not
disconnect
the
external
monitor
while
the
computer
is
in
standby
mode
or
hibernation
mode.
If
no
external
monitor
is
attached
when
the
computer
resumes,
the
computer
display
remains
blank
and
output
is
not
displayed.
This
restriction
does
not
depend
on
the
resolution
value.
Press
Fn+F7
to
bring
up
the
computer
display.
Note:
If
you
use
the
Fn+F7
key
combination
to
apply
a
presentation
scheme,
press
Fn+F7
at
least
three
times
in
three
seconds,
and
the
image
is
displayed
on
the
computer
screen.
Problem:
The
computer
does
not
return
from
standby
mode,
or
the
standby
indicator
stays
on
and
the
computer
does
not
work.
Solution:
If
the
system
does
not
return
from
standby
mode,
it
may
have
entered
standby
or
hibernation
mode
automatically
because
the
battery
is
depleted.
Check
the
standby
indicator.
v
If
the
standby
indicator
is
on,
your
computer
is
in
standby
mode.
Connect
the
ac
adapter
to
the
computer;
then
press
Fn.
v
If
the
standby
indicator
is
off,
your
computer
is
in
hibernation
mode
or
power-off
state.
Connect
the
ac
adapter
to
the
computer;
then
press
power
button
to
resume
operation.
If
the
system
still
does
not
return
from
standby
mode,
your
system
may
stop
responding
and
you
cannot
turn
off
the
computer.
In
this
case,
you
need
to
reset
the
computer.
If
you
have
not
saved
your
data,
it
may
be
Solving
computer
problems
22
ThinkPad
®
T40
Series
Service
and
Troubleshooting
Guide