I have also the problem that the battery won't charge.
I have already replaced the battery, the adapter and even the power board. It didn't help.
The computer runs well with the power cord. I had XP, VistA and windows 7 installed. It makes no difference.
I don't know what to try next.
Well, today I gave it another try.
I tried one more adapter today. I wasn´t expecting much, as I had already bought an aftermarket adapter and an original used adapter before, which both didn´t work.
This adapter though does work. I deliberately chose an adapter with an higher output. This adapter has 90W instead of 65W output. I am not totally sure, that this makes the difference. But after all it works! :-))