my sound output won't work and headphone port is possibly broken

my laptop has been fine all day and now for some reason the sound output doesnt work. i believe the input does because in system preferences it seemed to pick up my voice. my volume is turned all the way up in every place i can think of and there's nothing. also there's a chance that my headphone jack might be broken but i can't tell because the sound isn't working regularly. please if anyone can help i would appreciate it! thanks!