My daughter's Toshiba Laptop won't power up. She has tried removing the battery and plugging in the adapter only and still no signs of life. How can we find out if it's adapter or battery or other that's at fault. We were told that if the laptop won't come on when plugged into the mains via th adapter then it's most likely the adapter at fault, we obviously don't want to waste money buying something if it turns out to be a diffrent problem all together. Can anyon help.Thanks