Solved: No wall power but it will still charge the battery?! Help!

So I'm fixing (or trying to fix) a friends laptop. It's a HP Pavilion zv5120us. The problem is that when powered on, the laptop will not accept power from the AC adapter (which should be low voltage DC power when it get's to it right?). It will however charge the battery when the computer is shut off. So it will run till the battery is dead, then charge itself and then you can turn it on again.

Apparently the zv5000s have similar problems like, no battery charge, no power whatsoever and most of these problems originate from the AC jack. I HAVE ALREADY BOUGHT AND INSTALLED A NEW JACK. My soldering was top notch. The problem persists in exactly the same manner. I have also tested the AC adapter. It has a green LED that comes on and with a multimeter it registered something like 40.9 on the 200 setting for AC volts. All these things make me think it's some software problem. Maybe there's some stupid setting that got switched so it won't run off wall power.

If anything triggers a thought for anyone please reply, I want to get rid of this thing.

 

Double post. More info here http://forums.techguy.org/hardware/702808-solved-laptop-will-run-off.html