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.
So if you are using the USB wire mouse, then I strongly recommended to use Wireless Mouse. I also solve wireless mouse not working issue, so follow some important tips to solve mouse not working issue. Check your USB connection, many times if your USB connection looses then your mouse not responding properly.