It seems either your charger is bad, or the motherboard (charging port attached to motherboard). First I would try another charger, maybe a friend has a dell charger? They are fairly cheap as well, 20 to 30 bucks.. But Im thinking the port on the mother board you stick the charger into may be damaged. For this you would need to buy another motherboard, or see if it is repairable by sodering the charging port back to the motherboard. Your hard drive should still be fine, you can get the files off of it by repairing the laptop, or you could even get a 2.5" hard drive usb enclosure, then plug it into another computer.