I have a Dell Inspiron 5559 laptop and recently a circular portion came off from the DC Jack that is possible made from plastic. I realized this had been somehow broken. The AC adapter was still possible to be plugged-in but the battery did not seem to charge. However, the laptop could work on AC power and the battery power was not being used. I ordered a new DC jack from e-bay. I completely dissembled the laptop and installed the new DC jack. Now, the laptop still says it's not charging (but can detect that it's plugged in). The battery is running out now and that means it's not even using the AC power anymore. What can possibly go wrong? I believe the battery and the adapter is still fine and it's been under a year only.