So I was listening to some music on my headphones, and then the music muted for a second and then unmuted. Straight after that like 5 seconds later the music stopped. So i unplugged the jack and there was no sound. I looked into my audio jack and there was no red light either and also NO volume locking. I need help... I restarted my computer and i noticed that the start up sound was muted as well. I've already checked all the settings they arn't muted.. so wtf is going on with my macbook pro !