The audio on my 2006 MacBook has recently stopped working. I thought the internal speakers might have blown, but the audio doesn't work even if I use headphones or external speakers through the headphone jack. When I use the volume control buttons, everything looks normal - I don't get that symbol that it seems most people do when their audio isn't working. The levels will go up and down but without the sound usually associated with the volume control. I checked out the sound option in System Preferences, and everything is normal. I'm running OS X version 10.4.11. I've tried rebooting and nothing changes. All the other threads I've seen seem to have that symbol when using the volume control, or something is different under System Preferences, but everything is normal. Any ideas?? Thanks so much!