Mouse Hardware Checks:
The hardware check for the mouse involves isolating it from its host port. Simply replace the mouse to test if the device is faulty. If the replacement mouse works, then the original mouse is probably defective. If its electronics are not working properly then it might need a cleaning, or a new trackball. However, the low cost of a typical mouse generally makes it a throwaway item if simple cleaning does not fix it.
Incase, the new mouse does not work too then chances are higher that the mouse's electronics are working properly. In this case, the mouse driver or the port hardware must be the root of the problem. If the driver is correct for the mouse, the port hardware and CMOS configuration must be checked.
The system board usually contains all the port hardware electronics and support. Hence it must be replaced to restore the port/mouse operation at that port. However, if the system board mouse port were defective, another option would be to install a mouse that uses a different type of port (for example, a USB mouse can be used to replace the PS/2 mouse).
