I have a 17 inch SR MBP which I bought just after the refresh, and today I got a strange problem. While I'm at my desk, I use external speakers to listen to music. When I leave my desk I simply unplug the speakers and the music starts playing out of the laptops built-in speakers. However, today when I unplugged it, the speakers on the laptop did not output any sound, and a red LED I had no idea about came on inside the audio out port as if it were asking me to put the cord back in. The external speakers still work, but when I unplug them, I get no sound output from my built-in speakers EXCEPT when I reboot, I get the chime. Also, it will not let me adjust the volume with the speakers unplugged. not that the volume would matter, since it's not outputting any sound anyway. Has anybody had this problem, and does anybody know how to fix it?