Sorry, missed that part of the post. Well if you replaced the jack and tried another AC adapter, then that does indeed leave only one possible source of the problem. As ejn63 mentioned in the above post, that leaves the charging circuit and that is on the main board. You could try the basic reset method though I suspect it will not make a difference. Unplug the adapter. Then remove the battery. Press the power button for 30 seconds. Connect everything back up and power up. If that is unsuccessful, then a new main board is your only option.