This video shows how to reset your AC adapter to resolve power issues with your Dell laptop. By disconnecting and reconnecting the adapter, you can check if the charger is functioning properly through the LED indicator.
To reset the AC adapter, turn off the computer and disconnect the adapter from the laptop and wall outlet for 15 seconds. Remove the cord from the adapter brick, reconnect the cord to the brick, and plug the charger into the laptop and wall outlet. If the LED indicator on the adapter is on, the charger is working correctly.