Hey guys, I've ran into an interesting problem with my MBP. Earlier today, I was listening to some music with some headphone on with my MBP. After removing the headphones, I realized I no could no longer adjust the sound volume. It was as if it wasn't detecting an output device. I also happened to notice a red light emanating from the headphone/digital-in jack. This was obviously the optical light/laser/sensor thing for the digital audio. My MBP was stuck using digital audio in, but yet there was nothing plugged in. I googled this issue, and found reference to a couple threads on various forums. One on MacFixIt from January '07 was somewhat lengthy, with several echoing that they had the same issue. Apparently, the sensor or mechanical device inside the jack gets "stuck" in the digital-in position, therefore not allowing sound output to the internal speakers. It was suggested that when this happens, to rapidly insert and remove a set of headphones into the jack several time. Sure enough, after about 6-7 times, it finally "caught" and the red light went off and sound was restored to my internal speakers. Others in that thread advised that they took their MBP in for repair and the left IO board at to be replaced. I really don't like the idea of my MBP being opened up. My experience is that laptops just aren't quite the same once their gotten into. I guess my question is this: Has anyone here had this same issue with their MBPs? I frequent this site virtually every day, and honestly don't ever recall hearing of this before. Is this a widespread issue? I'm wondering if it was just a quirk, and it will work fine now. Inserting headphones now seems to work properly. Very strange. Just thought I'd get some more input on the issue. Thanks guys!