Hi! I just bought the E8 White Model of Toshiba Dynabook a week ago and when I started using it, I used the power outlet instead of the battery. But recently I tried bringing somewhere and used the battery which was 100% charged. I opened the PC and everything works fine but after two minutes the screen suddenly turns black but the computer is still on? I was wondering if anyone knows what the problem is and how I can fix it? Thanks so much!!!