My headphone port stopped working. I cannot select it in the preference window and after some searching on the web and this forum I do not have the red light issue. Most importantly when connecting my headphones nothing happens. I only have one device for sound output to select and that is my internal speakers. What can I do to check if it is a hardware or software? Maybe drivers? I had Airparrot 2 installed and it was a pain to remove (Only app I would assume interferes with audio drivers). This is happenning on an early 2011 Macbook Pro 15"