I have a Cordless Optical Mouse for Notebooks and a MacBookPro with Leopard. I used to be able to just plug in my mouse and go, but now the mouse won't move anything. The Mac recognizes it, it comes up as a detected device, but the cursor does not move or click with the mouse. I changed the batteries, and the green light on the bottom of the mouse is on, but the light on the end of the usb stick is not. I don't see how it could have gotten broken since it usually sits in a drawer. Any help?