Hi,
The light on the mouse should be on even when it is not connected. Check the batteries and make sure they are installed correctly. If the batteries are good, in the right way, and you still do not get the light, you are probably going to need a new one.
Thanks for using Fixya.
Your computer also has a connect button. If it is a USB optical mouse, you must push the connect button on the receiver that is plugged into the USB port as well as the mouse (and keyboard if it's all a set) If the mouse receiver is in the PC, like some Sony's...look around for the real tiny reset button..it's there somewhere.
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