When you take the box out, towards the bottom right as you look at it youll see a spring hanging down, only 0.5 cms, itll be trapped just now so have a look before you slide the box back, if you still cant make it out, take a pic and send it to me and ill highlight the spring and send it back! but im sure itll be obvious! thats how i felt when i put the box back and had no neutral light!!!!!! again the gps got damaged, because i forgot to remove it before sliding the box back in!!!