Laptop fails to run on AC Adapter

Hey, I have a HP Pavilion dv5000 series Laptop. It's fairly old now close to 3 years. Last Fall the Original AC adapter had taken damage and thus i was forced to get a new one. This new one is a 65W and ever since the day i recieved it. It was a little bit off. at first it needed to be moved around or "Jiggled" a little bit but it would charge fine afterward. and soon after it no longer required you to do so. Could just plug it in and it would be all set. However recently it has been requiring alot of work to get it to Charge/Run on AC Power. and now it won't Charge at all. It started out by occasionally flashing the power, and charge display lights on the front of the laptop. Now I'm not sure what solution there is for this problem. Or whether it is the AC Adapter failing to charge or if the intake to the Laptop is damaged or malfunctioning.