Headphones don't work after update

My Inspiron 15 has no headphone jack so I plug the headphones into my external monitor. Since I did a Dell-recommended update today I can't get any sound through the headphones, only through the laptop speakers. Can anyone help?

You can test the jack by switching to the Windows native audio driver.
1. Open the Device Manager (type devmgmt.msc in the Windows search box).
2. Expand the "Sound, video & game controllers" and right click on "Realtek High Definition Audio".
3. Select to "Update Driver Software".
4. Click on "Browse my computer for driver software".
5. Click "Let me pick from a list of drivers on my computer".
6. Put a check in the box "Show compatible hardware" if not already checked.
7. In the list of devices, click "High Definition Audio Device" (the native driver).
8. Click "Next".
9. On the Update Driver Warning box, click "Yes" (install the driver).
10. Restart the laptop if prompted. If not prompted, then no need to restart.
[To get back to the Realtek driver,  do it again but reverse the names in steps 2 and 7.]
If the jack works all right with the native driver, it means that the Realtek driver is buggy, which is not unheard of.
If it doesn't work with the native driver  then most likely the jack needs to be replaced.

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