Audio Clicks Off

Im building a house song and everything was working great and then i tried to change a single note and now whenever play the song no audio comes out…the song works fine before this one point but once it hits that note i tried to change, it makes a click like the sound you hear when you plug headphones in or pull them out while you are wearing them…no matter how many times press undo of no matter how many tracks i delete i cant get the sound back…all the track scopes show that everything is working, only the master track looks a little glitchy. Does anyone know what to do?