I plugged in my headphones then when i unplugged them the computer speakers no longer worked so i plugged in my headphones in the front of the computer but for some reason I could not hear any sound so I then plugged in my headphones into the back of my computer (I found a 3.5mm audio jack there) and then I could hear sound from my headphones.So the problem now is that if I want to listen to audio on my computer the only way to do that is to plug in my headphones into the back of my computer and the built in speakers no longer work.