Alright, I know this sounds crazy, but this was what I experienced.
Basically this particular port, which I have been using for my mouse served me quite well. Until just a few moments ago.
At first I thought it was my mouse, then I plugged that to another port and it worked. Then I thought that the port itself was damaged. Something triggered me to use my USB extender and the mouse worked again.
What? Why? How?
