IBM ThinkPad R40 series Service Manual page 31

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.
Problem: Your computer does not enter standby or hibernation mode.
Solution: Check whether any option has been selected that would disable
your computer from entering standby or hibernation mode.
Problem: The Fn+F12 key combination does not cause the computer to enter
hibernation mode.
Solution: The computer cannot enter hibernation mode:
v If you are using one of the IBM communication PC Cards. To enter
hibernation mode, stop the communication program, and then remove the
PC Card or disable the PC Card slot, using the Control Panel.
v If the hibernation mode is not enabled. To enable it, do as follows:
Solving computer problems
Chapter 2. Solving computer problems
19