If your computer mouse is not working, it could be for several reasons. These reasons include:

Hardware Issues/Bad Port

To determine if your mouse issues are related to a bad port:

  1. Use a different mouse and see if it works.
  2. If the new mouse works, try the old mouse with a different computer. If it still does not work, you can determine that the issue was with the mouse and not your computer port.

Bad Mouse

  1. If you are using a wired mouse, check the mouse wire to see if it is cut, frayed, or otherwise damaged.

Outdated or Missing Mouse Driver

  1. Check your computer's Device Manager to see if a mouse driver is installed. If not, try installing one.
  2. If a mouse driver is installed, check if it is up-to-date. Update the driver if it is outdated. 

Mouse Software or Driver Conflict

Check if the mouse works when your computer is in Safe Mode. If it does work, there is likely a driver or software conflict between your mouse and computer.

To fix this problem:

  1. Open Windows Device Manager.
  2. Scroll down to the mouse option and click the “+” symbol.
  3. Highlight each mouse device.
  4.  Press “Delete.” This will remove all mouse options from the computer.

Mouse Not Connected Properly

USB Mouse

If you are using a USB mouse:

  1. Disconnect the mouse cable and connect it to a different USB port.

If the mouse is connected to a USB hub: 

  1. Unplug the mouse cable and connect it to a USB port on the back of the computer.

If you are using a mouse with a PS/2 connection:

  1. Check the back of the computer to verify that the mouse is plugged in properly (i.e., to the PS/2 mouse port and not the PS/2 keyboard).
  2. If the mouse has worked properly in the past, turn off the computer, then disconnect the mouse, wait a few moments, and reconnect it.
    1. Note: A PS/2 mouse should not be disconnected and reconnected while a computer is turned on.
    2. Tip: If the computer's keyboard is working, you can shut down Windows by pressing the Windows key to open the Start menu, and then using the arrow keys to move to the “Shut Down” option.

Wireless mouse

  1. Make sure the mouse is receiving power. You can do this by checking for some indication of power. Usually, this will be a light somewhere on the device. If your mouse has a power switch, it is often located on the bottom side.
  2. If the mouse does not appear to be on and toggling the power switch does not work, replace the mouse's batteries.
  3. Make sure the wireless receiver is within range, and is not blocked.
  4. Disconnect the wireless USB adapter and plug it in to a different port.

Frozen Computer

If your keyboard has a “Num Lock” key and indicator light:

  1. Repeatedly press the “Num Lock” key on the keyboard. The “Num Lock” indicator LED on your keyboard should turn on and off as you press the key. If this indicator does not change, your computer is frozen.
  2. If your computer is frozen, simply reboot the computer by turning it off and then on again.

If your keyboard does not have a “Num Lock” key or indicator light:

  1. Press the “Ctrl,” “Alt,” and “Del” keys at the same time to open the Windows Task Manager and close out of all running tasks. If the Windows Task Manager does not open, reboot your computer by turning it off and then on again.