Macbook audio stopped working

[mikemanblah]

So last night, I had the audio on 1 volume, then next time i changed the volume, it was at full but still sounding as though at 1 volume. Then i restarted, and it doesnt work at all anymore. What should i do? Theres no red light on in the port

 

[sydenham]

Are you listening through your computer or feeding an external source?