For a couple of weeks, I've been trying to fix a friend's audio on a Sony VAIO FS. Without anything plugged into the headphone port, there is no audio coming from the laptop speakers. Plug in headphones halfway (on the verge of complete contact) there's audio from the laptop speakers. Plug in the headphones all the way, the headphones work normally. Any specific idea as to what the problem is, and how to go about solving it? I'm not 100% certain that the user was rough with any headphone plugs, but it's certainly not out of the question.