TAG MIL-BOOK 10 - Manual (Page 97)

If you are using any file transfer functions, make sure that both the
computer and the IR device have the appropriate software running.
Make sure that there is no device radiating infrared rays, such as
remote-controlled devices or wireless headphones, near the
computer or device.
Make sure that no direct sunlight or fluorescent lamps are near the
computer or device.
Make sure that the IR ports are clean.
Keyboard and Mouse Problems
The keyboard does not respond.
Try connecting another external keyboard. If it works, replace the
former keyboard as it may be defective.
The numeric keypad is disabled.
Make sure that the Num Lock is switched on. (Check if the Num Lock
Indicator appears or not.)
The external keyboard does not work.
Make sure that the keyboard cable is properly connected.
The PS/2 mouse does not work.
Make sure that the mouse cable is properly connected.
Make sure that the pointing device is enabled in the SCU program.
The serial mouse does not work.
Make sure that the mouse cable is properly connected.
Make sure that you connect the mouse before booting the computer.
Make sure that the serial port is enabled in the SCU program.
Troubleshooting 8-9