I am not sure if this will workm, but it is worth a try. There is something called Dell Quickset utility. In this screen, go into power management and set it to maximum battery. possibly might fix it. What I think is that the system is automatically switching its power output to lower level when only on battery to give you a longer battery life i think..So try it.. might work:smileyhappy:

I was thinking the same thing! :smileyhappy: