OK. pulling harder is not the answer. there are actual tools similar to a hollow screw driver to get them out. you shouldn't reuse the pins but its possible if your carefull. if you don't have proper tools taking a small pin and pushing on the slots on the side of the connector will release them but you must pull wire out while pushing with the pin
Thanks for your reply! The pins broke off the old jack connector (the white plastic bit connected to wires with the actual jack on the other end) and are stuck in the motherboard. When I pulled the connector out, I had to pry it and it left the pins behind. I can't get them out to put the new one in so I have no way of making a connection. I hope that makes sense? Basically all I have now is 4 holes in the motherboard with the old pins stuck in them, and I can't remove them to plug the new one in!