The sound refuses to work with headphones in. I have: Upgraded OS since Reset PRAM The sound works fine as normal, playing sound from laptop speakers. Once I put the headphones in the volume bar greys out. I have held option key right elected the volume in menu. With headphones not plugged in. Output Device - Internal speakers (checked Input Device - Internal microphone (checked), line in With Headphones plugged in and volume greyed out. Output Device - Digital out (checked) Input Device - Internal microphone (checked), line in Here is the screen I get with headphones in and when i go to preferences.