Sound issue during in game play

I’m having a major issue and it’s finally starting to puss me off I got borderlands I love the game but I believe I’m towards the end of the main story and my game refuses to play any sound, nothing wrong with the tv or gaming system because every time I’m in the game menus all the sounds play menus charrecter etc. please help it’s really frustrating it’s like playing the game on mute the entire time