Rispondi a "Audio jack problem, no speaker sound, red light"Put a screwdriver into the jack... you will feel a little piece of metal. Try to open that piece with your MacBook turned on, music on... and you will hear the sound when the piece of metal has in the correct place. IT'S VERY EASY. I made that in less of a minute. Sry for my english, i hope can help. Cheers!