If you look into the history you find out that part of the reason that Sotec had to go was lack of parts. However ikenfixit.com has repaired many like yours and if the jack is not available he has a workaround. Drop him a line if Avertec doesn't send you the part.
The connection between AC adapter and laptop has gone bad. I have to jerk the AC adapter's connector to various angles in order for it to supply power to my laptop (which is a much-battered Averatec 3225 HS). I took the laptop apart, and found that a small detachable part containing the pin that the AC adapter connector plugs into is much burned out. I'm guessing this would be a cheap part to replace, but I don't have a serial number or anything. (There are markings of "HCH" and "4" on it.)
Am I SOL? Is there somewhere I can look up for replacing this part? I doubt Averatec would be helpful. I can put up a picture of the burned-out part later today.