Troubleshooting charts
Problem Action
The PS/2 mouse or
pointing device does not
work.
Unless you are using a serial mouse, make sure that the pointing device is
enabled in the ThinkPad Configuration program.
Make sure that the mouse or pointing-device cable is securely connected to
the computer.
Try using the TrackPoint. If the TrackPoint works, the error might be due to
the mouse.
If your mouse is incompatible with he IBM PS/2 mouse, disable the TrackPoint
using the ThinkPad configuration program.
Note: See the manual supplied with the mouse for more information.
The serial mouse
doesn't work.
Ensure that the TrackPoint has been disabled in BIOS. See “Config” on
page 18.
If the serial mouse has its own driver, ensure that the driver has been
installed correctly. Refer to the serial mouse users guide for details.
The mouse buttons do
not work. Change the mouse driver to Standard PS/2 Port Mouse, and then reinstall PS/2
TrackPoint. See the
Online User's Guide
for how to install the driver.
A number appears when
you type a letter. The numeric lock function is on. To disable it, press and hold Fn; then press
NumLk.
All or some keys on the
external numeric keypad
do not work.
Make sure that the external numeric keypad is correctly connected to the com-
puter.
All or some keys on the
external keyboard do
not work.
To use an external keyboard, you can attach it to the computer either directly or
through the keyboard/mouse cable. Make sure that:
The keyboard cable is correctly connected to the computer (if the keyboard is
connected directly to the computer).
The keyboard/mouse cable is correctly connected to the computer.
The keyboard cable is connected to the correct side of the keyboard/mouse
cable.
If these items are correct, disconnect the keyboard/mouse cable from the com-
puter and make sure that the operation of the system keyboard is correct. If the
system keyboard works, have the keyboard/mouse cable or the external keyboard
serviced.
94 ThinkPad 240 User's Reference