It's a very long and complicated procedure, you can get all the equipment, screw drivers, soldering tools etc. and take apart your laptop yourself and solder the three spots where the DC Jack connects into the motherboard, If that don't work, order a new DC Jack and solder that on in the old ones place.

Some computer shops will do this to laptops but you are still looking at not a cheep price, but it won't be 300 bucks. lol