A Power Switch Problem; Keyboard Problems - Lenovo ThinkPad G40 Series Service And Troubleshooting Manual

If you forgot your supervisor password, a Lenovo authorized servicer can
not reset your password. You must take your computer to a Lenovo
authorized servicer or a marketing representative to have the system board
replaced. Proof of purchase is required, and a fee will be charged for parts
and service.

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 one has been set.
If an external PS/2
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 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.
®
keyboard is connected, the numeric keypad on your
Solving computer problems
Chapter 2. Solving computer problems
19