Installed LL3 and all was working well for a while. Then after various tweaking, now when I boot up after I type in the password the mouse cursor is there but the mouse (USB wired) is unresponsive. The notebook touchpad still works fine. Unplugging/replugging the mouse resolves the issue but needless to say, this is not a usable workaround. Any ideas how to get things back working again? how to re-install the mouse drivers or sub-system?