hi i have a hp ominbook 6000 it runs fine with the ac adaptor but cuts out if you take the ac adaptor off,it hAS a new battery that has been tested and to be fine,windows xp sp2 is installed and reconises the battery and stats its 100% charged, the charge light is on red but sometimes can be yellow and green,also the laptop does run with the battery removed ,any idears on y it wont run on the battery?????? cheers