#!/bin/sh  
echo "Make sure to quite all sound using applications before running this (i.e. browsers, skype, garageband, etc.)"  
sudo kextunload /System/Library/Extensions/AppleHDA.kext  
sudo kextload /System/Library/Extensions/AppleHDA.kext  
sudo killall coreaudiod  
echo "Done, try changing the volume up and down a bit."