My logitech mx 5500, well

Question

my logitech mx 5500, well like for some reason the keyboard is stuffed like you cant type no letters come up and also when i play music and i use the play and pause thing on the left hand side it works but i cant type its connected when i press it and i even tried to reinstall the software and it does not work what does this mean do i have to buy a new keyboard or can it be fixed?