Northern Ireland is the smallest of the four countries of the United Kingdom in terms of both area and population, containing 2.9% of the total population and 5.7% of the total area of the United Kingdom.
If you are using a wireless mouse with a USB connector and a PS/2 keyboard, verify that the USB mouse is plugged in a USB port on the computer and that the purple keyboard PS/2 plug is connected to the purple PS/2 port on the computer.
Connect a USB mouse to an open USB port with the computer turned off or on. If the mouse has a cord, the operating system detects it and it becomes usable immediately. If the mouse has more than two buttons, you may need to install driver software from the manufacturer to make the extra buttons usable.