"MacBook won't charge with new battery and charger"에 답변If you look in that picture you will see a very thin white gasket around the pins. I had same problem and it turned out for me it was just the insulating gasket in the external port. I found part of it still intact and guessed partial insulation might be that causing a short. The gasket is made of very thin tape and sure enough when I made a copy and put that in, it charged fine on the new charger I had bought. The old charger is dead (on this and a friend's machine) so I presume it was fried shorting while I repeatedly tried to charge before. P.S. I made the copy of the gasket size needed by making an inverse template by pressing Blutac into the magsafe port hole and used that as a block to print an outline onto the tape. For me I didn't even need to open the mac up!