I have a 2007 Macbook that has Snow Leopard on it. The audio works just fine with the headphones in and I can hear the chime sound from the speakers when I turn it on, but that's it.. I tried to reboot it and fix the permissions so far, but I have had no luck. Also, I should mention that inside the headphone jack is red all of a sudden.But the audio works just fine with the headphones inside.. I also tried plugging in the headphones and plugging them out, but that hasn't worked either.. Any help would be very much appreciated!