I need help my mouse light is on but it wont move or click
electronics are cheap, buy a new one
i think one of the data wires in the cable (or connections) is broken
disconnect (unplug / desolder - keep track of which wire is where) the cable from the mouse and test all wires with led and battery
if usb / ps2 plug is bad you can
use the cable and plug as is for diy usb powered project (the power wires are still ok). use another cable for the mouse
cut wires + pull the metal part from the plastic part + fix it + drill old cable remains out of the hole in the plastic part + make plug again
break the plastic off the plug with pliers + fix + use uncovered (not recommended - vulnerable and easy to short out accidentally) or cast new plug from hot glue etc
Have you replaced the battery?
And since you usually move mice with your hand - have you glued it to the desk or something?