So I upgraded to Windows 7 from XP yesterday, and ever since it seems like my headphone jack just isn't working. It was working before the upgrade, and the headphones work (I've tried three pair), but when I plug headphones into the headphone jack now, sound continues to play out of the speakers, and no sound comes from the headphones. It's like it doesn't even realize I've plugged the headphones in. I've already tried updating my drivers, and it said I have the most up-to-date drivers already. If it matters, I don't have a sound card, I have a "high definition audio device". Any help would be appreciated, as I don't know what to do to fix this. Thanks.