IBM ThinkPad 92P1559, Service And Troubleshooting Manual, Page: 27 / 96

A power switch problem
Problem: The system does not respond, and you cannot turn off the computer.
Solution: Turn off the computer by pressing and holding the power switch for
4 seconds or more. If the computer is still not reset, remove the ac adapter
and the battery.
Keyboard problems
Problem:
Some or all of the keys on the keyboard do not work.
Solution: If the problem occurred immediately after the computer returned
from standby mode, enter the power-on password if any is set.
If an external keyboard is connected, the numeric keypad on your computer
does not work. Use the numeric keypad on the external keyboard.
If an external numeric keypad or a mouse is connected:
1.
Turn off the computer.
2. Remove the external numeric keypad or the mouse.
3. Turn on the computer and try using the keyboard again.
If the keyboard problem is resolved, carefully reconnect the external numeric
keypad, external keyboard, or mouse, making sure that you have seated the
connectors properly.
If the external numeric keypad, external keyboard, or mouse are not attached,
and any keys on the keyboard still do not work, have the computer serviced.
Problem:
A number appears when you type a letter.
Solution: The numeric lock function is on. To disable it, press and hold Shift;
then press NumLk.
Problem: Some or all of the keys on the external numeric keypad do not
work.
Solution: Make sure that the external numeric keypad is correctly connected
to the computer.
Standby or hibernation problems
Problem: The computer enters standby mode unexpectedly.
Solving computer problems
Chapter 2. Solving computer problems
17