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.
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
lost. To reset the computer, press and hold the power button for 4 seconds
or more. If the system is still not reset, remove the ac adapter and the
battery.
Solving computer problems
22
ThinkPad
®
T40 Series Service and Troubleshooting Guide
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