Logitech mouse not working even with fully charged battery also

Hi,

I am using Logitech mouse. It worked properly for so many days. But recently it is not working at all. I removed the USB and changed different ports and PCs. But no use. The laser light is also not coming. The green light is coming on when I click the mouse. So I thought it is not related to battery issue. What could be the problem here? I am out of warranty on this one. So, is it simple to fix or not. Please let me know if anybody has any solution for this. Thanks a lot!