No sound from headphone jack -- here's what I've tried -- now Genius bar?

Hi all,
Some time ago the headphone jack on my MacBook decided to stop putting out sound. I've searched a bunch of forums looking for clues but no dice yet. I've looked into a bunch of things trying to diagnose and fix this problem, which I'll summarize below:
In System Preferences > Sound the Output toggles between Headphones and Internal Speakers when I plug in and unplug the headphones, so I know the jack is responding. The mute button is not selected and volumes are up.
In Audio MIDI Setup > Properties for Built-in Output > Source: Headphones, volume sliders for 1 and 2 are up and not muted. (M is greyed and all the way down but I understand this is for mono.)
I deleted these files and rebooted:
com.apple.audio.DeviceSettings.plist
com.apple.audio.AudioMIDISetup.plist
Now here's the crazy part -- my girlfriend has reported the headphones have worked recently with DVD Player. Earlier today it was working with DVD Player only to go out after hitting pause. I quit and relaunched DVD Player and they started working again. Hit pause and they died again; now after several relaunches nothing's happening.
So my next step is probably to visit the "Genius Bar" at the Apple Store. Is there anything else I can try that I've not thought of? I've seen a number of forum posts on this problem, so it sounds like I'm not the only one this has happened to.
Thanks for your help.

Took this in to a repair shop and they ended up having to replace the logic board. Thankfully it was still under Apple Care.

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