Audio jack not working
Seeing that it works (see question's comment), this answer is somewhat unnecessary, but for the future in a Q&amp;A fashion, I'll put in my 2 cents.

There are a couple of things to know here. Glitches happen, and stuff breaks. We obviously prefer the first. Here's a couple of steps to isolate the cause.


Quoting the IT crowd "Have you tried turning it off and on again?". Seems dumb, but it works. If this fixes it, it's a software issue. (Hopefully one you won't be seeing again)
Quoting the IT crowd again, "Is it plugged in?". Check that the connections inside the port are clean and nothing is stuck in there. Don't go sticking anything wet in there, but maybe a very very mildly damp q-tip could do the trick.
If neither of these do anything, try a factory reset. If that doesn't work, it's hardware damage.