I have an older dell latitude (its a few years old, im not sure exactly how old). Last night, the battery stopped charging. When the powercord is plugged into the wall, the indicator light on the powercord lights up, but the light goes out when the powercord is plugged into the laptop. Does this sound like a problem with the powercord itself, or possibly the port? Or could this be a bigger issue with the computer..? Thanks for any help!