Since a couple of days, my MacBook Pro (end of 2007, 15" 2.33GHz Core 2 Duo) does not output any sound to the internal speakers. Instead, it always outputs through the optical line out (at leas I think it does, since I can always see the red light). I have tried manually switching output by going to the System Preferences -> Sound and then selecting the output tab. The only device shown is name: "Digital Out" type: "Optical digital-out port". Same when option-clicking the sound toolbar menu. When using headphones, everything works as expected, but when plugging them back out, it goes back to optical out. I'm running Mac OS 10.7.1. The system had a clean install (formated the HD) just a few weeks ago. Is there any way to "force" it to switch to the internal speakers?