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I'm going to assume that this is an optical mouse (do they even *make* wireless mice with balls in 'em any more???) So, my question to you is as follows: does this mouse have a light on the bottom? If not, the mouse is dead. If there is a light, but you still can't get anywhere after you've reset, etc, then there's a good chance that the transmitter is dead on the mouse. You can test this by trying to connect to another Logitech wireless receiver and see if you can use the mouse on it.