I just disconnected my headphones from my mid-2009 MBP 15" and it seems the headphone jack gets stuck in "headphone mode". I can get it back to "internal speaker" mode my wiggling the headphones in the jack a bit but that sucks. It takes several minutes to get it to switch back. What can I expect from a Genius Bar visit? I can't be without my laptop. Is this a one day fix?