Lenovo ThinkPad T60 Series Service And Troubleshooting Manual page 29

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.
– If the standby indicator is on, your computer is in standby mode.
Connect the ac adapter to the computer; then press Fn.
– 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
Chapter 3. Solving computer problems
21