well i had got a wireless mac keybord when i got this imac and all the buttons related to playing music and movies(play/pause, mute louder & softer volume rewind and fast forward) worked as it should but i had broke the keybord so i went to apple and got a new wireless keybord and now all the buttons related to playing music and movies do different things like when it shows the different screens i have open at once and other weird stuff not related to playing movies and music, so my question is how can i fix it?