Headphone jack not working?

Hi,

I've got a Sager NP8651. Just out of the blue, my headphone jack stopped working. It was working this morning when I had my headphones plugged in. Took them out. Then plugged them back in again just now and nothing. Didn't change anything, no new updates. I'm running Windows 8.1. Anyone know what might be going on?

Thanks!
 
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