My old mouse was a MS basic mouse connected through the USB port. The left button stopped working on it, so I decided to buy a new mouse. Both are optical. I brought the new one home, unplugged the old one from the usb (while the computer was still on) and plugged in the new one. I think something went screwy and I had to reboot, but I don't remember what happened. In any case, the new mouse works fine, except for one thing. Every once in a while, the pointer jumps. I mean, it just acts bizzare. It almost seems to happen at random. I'll be pulling the mouse down right, or somewhere, and the pointer will just jump to the top of the screen and head left, fast. It's annoying the h*ll out of me! Could this be a hardware problem with the mouse? Or did I fry the mouse when I plugged it in without turning the computer off? I don't think that's it, aren't USB devices supposed to be hot-swappable? Should I call Microsoft tech support, or should I just take the mouse back to see if it does the same behaviour on one of their computers?