Hi Guys Here is my story my friend brought me a laptop that is completely shut down and he told me to fix it. I asked what is the problem and he said I don't some one gave it to me and I don't know what caused the problem. when Looked the laptop I tried turning on but nothing showed up on the screen I plugged the power charger waiting for few minutes I turn on still nothing show up but this time the screen become white for like 2 seconds and then goes back to black. I thought the system is not getting enought electricity. my question here is what are things do you think might cause the system not to boot please list a whole punch problem that might cause the system not to boot. and I will go one by one and see if I can figure out. here is the laptop information Toshiba Satellite-L455-S5975 there is windows 7 on it I believe because I see win 7 sticker on the laptop.