My 3ys old Lenovo G550 has stopped accepting power from the power jack. It's been fluffy for a while and has needed massaging to work, but now it's game over. It's doesn't with/without the battery. Been surfing around and partly concluded that it's a weak point in this design. Was on the Lenovo support today, and it will be too expensive to let them work the problem. Also learned that the power jack comes as a pigtail that can be purchased, but the laptop needs a total tear-apart to exchange the cable. Have not been able to find instructions/videos showing the needed tricks. Anyone in here that can help, or has experience with the same issue?