Sorry, but I forgot to say that even with the blinking orange light, the computer works fine with the AC adapter plugged in.
Daughter just brought her Latitude C400 home from school fussing about the battery. Basically, when the computer is off and the adapter plugged in, the indicator light blinks orange...the Dell signal for low battery. The computer will not power up on battery alone, and the little button on the battery pack shows LED 2&4. I am assuming that she has killed her battery.
Any thoughts? Experience? Suggestions?