No matter how many times I stress that when the jacks start to fail, you should take it to the shop. With each delay and use the problem only gets worse and more expensive. Wiggling the DC Jack to make the positive side supply power to the board eats copper! Every time there is less surface pad left, and eventually you will totally eat all the surrounding copper making a 25 min job into a 1 hr job (or worse - unrepairable).
This jack nearly killed the motherboard which would require a replacement (expensive).