I've read through other posts on this topic as I've had this problem before, but I've always been able to fix it by inserting my headphones, wiggling them in the jack and then taking out the headphones. The digital sound out has been turned on and doesn't allow the internal speakers to broadcast sound. A total PITA. This time I've tried the matchstick, the headphones, repairing permissions, resetting the PMC... Anything I can think of that might help to reset this problem. Is there anything else I can try before I send my computer back to Apple. I have a 2009 July Macbook Pro 17". I use the computer every weekday for work so it will be a real problem if I need to send it in for fixing. Although Applecare in Japan is awesome and usually get your computer back to you within 48hours. Thanks for any ideas. And just to pile up the problems my router decided to kick the bucket this very afternoon. Luckily I got mobile wifi as well (for the work computer)... Hopefully the 3rd problem won't be a biggie.