My headphine jack simply won't work. I have tried multiple headphones, but it doesn't sense them or something because it continues playing out of the speakers.

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Is it a tablet?....phone?....laptop??? you dont say. If it is a laptop..make sure you are plugging it into the 'headphone' jack...not the input or mike jack. they all look the same except for color. if itis a tablet...go into the settings and see that the headphone jack is set to 'headphones' and not 'speaker'
It is possible you have a defective headphone jack...there is a small switch build into the jack that disconnects the speakers and turns the headphone audio path to the headphones. sorry..now I see what the device is
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