It sounds to be a break in the circuit somewhere between the charger and the connection, as you say.
You may have dragged the lead and broken a wire either in the lead or on the motherboard connection.
Unless you can check that there is low voltage output from the charger at the computer end of the lead, which would either eliminate the charger as the guilty party, or prove that the wire from the charger is at fault, then it looks like a trip to a local computer shop. Preferably not one of the big ones.
dave
ps
