This usually results because of a glitch on the Chromebooks. To resolve this issue please do the following:
- Plug headphone into headphone jack
- Click on the “settings” bar (bottom right – you should see clock, wifi, etc)
- Click the “right arrow” besides volume
- Click “Headphone”
- Unplug the headphone and it should auto switch back to speaker (Internal)
Now when you plug the headphone back in, it should auto switch to headphone.
Note: If this does not resolve the issue, please open a work order.