Keyboard, External Numeric Keypad, And Pointing Device Problems - IBM ThinkPad 755CX Manual

What If Your Computer Does Not Work?
Problem
The PC Card does not
work.

Keyboard, External Numeric Keypad, and Pointing Device Problems

Problem
All or some keys on the
system keyboard do not
work.
The pointer drifts when
the computer is turned on,
or after resuming normal
operation.
—or—
During computer
operation, the pointer
drifts when not using the
TrackPoint III.
216
IBM ThinkPad 755CX User's Guide
Verify that:
The serial addresses for the serial devices (serial port A, serial port B,
infrared ports, and Mwave telephony function) do not conflict with each
other. Check them in the ThinkPad Setup menu of the ThinkPad Features
program.
A serial address is reserved for the PC Card.
The PC Card is designed for the computer.
The software is suitable for use with the PC Card. See the instructions that
came with the PC Card.
If the PC Card has its own diagnostic instructions, use those instructions to test
it.
If the problem occurs immediately after the computer returns to normal
operation from suspend mode, enter the power-on password. If a power-on
password is set, you must enter the password.
If the external keyboard is connected, the numeric keypad on the system
keyboard will not work.
If the external numeric keypad or the mouse is connected:
1. Turn off the computer.
2. Remove the external numeric keypad or the mouse.
3. Turn on the computer and try the keyboard operation again.
If the keyboard problem is resolved, check the connection of the external
numeric keypad, external keyboard, or the mouse. If there is still a problem,
have the computer serviced.
Drifting is a characteristic of the TrackPoint III and is not a defect. The drifting
occurs for several seconds under the following conditions:
When the computer is turned on.
When resuming normal operation.
When the TrackPoint III is pressed for a long period of time.
When the environmental temperature changes.
Do not touch the TrackPoint III until the pointer stops moving.
Action
Action