IBM ThinkPad 340 Series Hardware Maintenance Manual page 214

If the tests detect a keyboard problem, do the following
one at a time to correct the problem. Do not replace a
non-defective FRU.
Reseat the three cables.
Replace the keyboard.
Replace the interposer card.
Replace the system board.
The following auxiliary input devices are supported for this
computer.
Numeric keypad
Mouse (PS/2 compatible)
External keyboard (with keyboard/mouse cable)
If any of the above devices do not work, reseat the cable
connector and repeat the failing operation.
If the problem does not occur again, recheck the
connector.
If the problem is not corrected, replace the device, and
then the system board.
TrackPoint II checkout
If the TrackPoint II will not work, check the configuration in
Easy-Setup by selecting Keyboard from the Config menu.
If the configuration of the TrackPoint II disabled, select
TrackPoint to enable it.
If this does not correct the TrackPoint II problem, continue
with the following.
The TrackPoint II does automatic compensations to adjust
the pointer sensor. During this process, the pointer moves
on the screen automatically for a short time. This
self-acting pointer movement can occur when a slight,
steady pressure is applied to the TrackPoint II pointer
while the computer is powered on or while the system is
running, or re-adjustment is required because the
temperature has exceeded its normal temperature range.
This symptom does not indicate a hardware problem. No
service actions are necessary if the pointer movement
stops in a short period of time.
If a click button problem or pointing stick problem occurs,
do the following:
1. Go to Easy-Setup screen.
2. Select an item with the pointing stick.
3. Press either the left or right click button.
4. Verify that both buttons work correctly.
If either the pointing stick or the click button will not work,
do the following actions one at a time to correct the
problem. Do not replace a non-defective FRU.
Reseat the three keyboard cables.
Replace the keyboard.
Replace the interposer card.
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IBM Mobile Systems HMM