I am helping a friend with a laptop. It is a Toshiba Tecra TE2100 w/ XP. With battery in, cord plugged in, the green cord light is on and yellow battery light is on. Pressing the power button causes the battery light to go out and the cord light flashes yellow. Taking the battery out w/ the cord attached, the cord light is on and green. Pressing the power button causes the light changes to yellow and flashes. The system will not boot up in either case.