you'd have to replace the dc jack which i belive in most cases is soddered on so you would have to buy a new one which is only like 20-30 bucks and sodder it on. if thats the case. if you're thinking about buying it just ask if you can check it out and give it a full diag cause it might be that the dc jack is messed up and thats easy enough to test. just take a multimeter and check the dc jack and also check the mobo cause it could be the mobo as well. then you don't want to buy the laptop.