Installing a PC computer mouse

Before getting started

  1. Difficulty of installing computer mouse should be a 1 out of 5.
  2. When connecting the PS/2 or Serial mouse, ensure the computer is off; if the mouse is a USB mouse the computer can be off or on during the installation.

Connect cables

PS/2 Mouse

  1. Connect the mouse to the PS/2 port on the back of the computer. Today, although many computers are still using PS/2 mice if you're using a USB mouse skip to the next section.
  2. When looking at the back of the computer you'll notice two PS/2 ports next to each other. Verify you're connecting the mouse into the teal or green connection as shown in the picture below. If your PS/2 ports are not color coded the mouse will be the connection furthest away from the left edge of the computer (when looking at it from the back). If the connections are vertical and not horizontal as shown below the mouse connection may be either depending on the case and motherboard. Look for a small symbol next to the port to identify what one is the mouse.

PS/2 port diagram Pictures of computer green and purple PS/2 ports.

USB Mouse

Connect the USB mouse to the USB ports on the back or front of your computer or if you are using a USB port hub, connect the mouse to the hub.

Illustration of USB connectionsConnecting USB mouse

Serial Mouse

Connect the mouse to the serial port on the back of the computer. If the computer has serial devices currently connected to the computer and the computer has two serial ports we recommend you use the first serial connection if you encounter problems connecting the mouse. Once connected depending on your computer setup you may need to configure the mouse in CMOS setup as found in the next section.

Serial mouse connections

Install software and drivers

Setup in CMOS setup

If you have connected a serial or USB mouse it may be necessary to setup the ports in CMOS setup.

If the mouse you are using is a serial mouse and it's having issues being detected verify that the serial ports or COM ports are enabled and assigned properly in CMOS.

If the mouse was a USB mouse, ensure that USB is enabled and if available, also ensure that the USB Legacy support is also enabled; this allows the mouse to work in legacy mode, for example, DOS.


Additional information

  • See the mouse, PS/2, serial port, and USB definitions for further information and related links on each of these terms.