None of my speakers work on my Macbook

My audio doesn't work at all. I know that some people have had the problem were a red light comes on in their headphone port, but from my understanding, that is from the port thinking that you have a headphone jack pluged in. However, I know this is not the problem, because if I go into system preferences/sound/output it changes from "headphones" to "internal speakers" when I unplug my earbuds. Please help, any suggestion or comments are very appreciated.