new hp nx7400?

out of the box this notebook will boot up until it's ready to load windows.then the screen goes black. the mute led goes on.the wi-fi led goes off.the powerled stays on and i can hear the notebook is still on. all this only on battery power. with the ac power in ,it works fine.but if i try factory restore with battery power it works fine. until its ready to load windows again. i tried a new battery, still the same problem