Answer to: battery has charge but mouse still not working.Odd, my MX mouse did the same thing yesterday. Batteries were fresh. Turning the mouse off and on lit a small green light on top indicating low battery. I plugged my transmitter into a different usb port, but discovered that my usb hub became disconnected somehow. If it cannot talk to the transmitter it acts this way. The MX has a 3 year warranty if this doesnt work.
Answer to: Why isn't my mouse working?Check for a function key that turns the built-in mousepad on and off. Mine is a silver button on the top left of the keyboard. It drove me crazy until I discovered it.