i have a dell xps m1330 and i just upgraded to windows 7 and the new dell bios a15 and now my battery wont charge over 50%??? the battery health is fine according to the meter and the charger is new .. i called dell mad:what help they were) they are telling me its my mother board and i need to pay 500 to get it replaced but it worked before the upgrade and now it wont idk what to do please help .. bios says its working even though it says its only at 50% no matter how long i have it plugged in