A Password Problem; A Power Switch Problem - IBM THINKPAD G40 Series Service And Troubleshooting Manual

Solving computer problems
Solution: Make sure that the memory card is installed correctly. If it is, but
the screen is still blank, and you hear five beeps, have the computer serviced.
Problem: When I turn on the machine, only a white cursor appears on a
blank screen.
Solution: Reinstall your operating system, and turn on the computer. If you
still see only the cursor on the screen, have the computer serviced.
Problem: My screen goes blank while the computer is on.
Solution: Your screen saver or power management may be enabled. Move the
TrackPoint or press a key to exit the screen saver, or press the power switch to
resume from standby or hibernation.
Problem: The DOS full-screen looks smaller.
Solution: If you use a DOS application that supports only 640x480 resolution
(VGA mode), the screen image might look slightly distorted or appear smaller
than the display size. This is to maintain compatibility with other DOS
applications. To expand the screen image to the same size as the actual screen,
start the ThinkPad Configuration Program and click LCD; then select the
Screen expansion function. (The image might still look slightly distorted.)

A password problem

Problem: I forgot my password.
Solution: If you forgot your power-on password, you must take your
computer to an IBM authorized servicer or marketing representative to have
the password canceled.
If you forgot your hard disk password, IBM will not reset your password or
recover data from the hard disk. You must take your computer to an IBM
authorized servicer or an IBM marketing representative to have the hard disk
drive replaced. Proof of purchase is required, and a fee will be charged for
parts and service.
If you forgot your supervisor password, IBM will not reset your password.
You must take your computer to an IBM authorized servicer or IBM
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.
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ThinkPad G40 Series Service and Troubleshooting Guide