So if you plug in headphones to the jack, and still hear sound coming out of the laptop speakers, it's probably due to the jack input set to Line In or Mic In, instead of Headphones or Speaker out.
Well, unlike older Dell laptops that may have had two input jacks, one for the speaker/headphone jack and another separate mic/line-in jack, newer Dell laptops typically only come with one input jack that can do multiple things.
If you recently bought a new Dell Laptop with Windows 10, you may be wondering why the headphone input jack is not working correctly when you plug in speakers or headphones (or possibly a mic).
