A few weeks ago i kinda broke my laptop screen, so my brother bought a new one. When he gave it to me it worked, windows was up and everything was working but when i left the computer for awhile and then came back, the screen was totally black. So i thought , , well okay, the laptop must have turned off or something. But when i pressed the power button nothing happend. I have tried for about 3 days now, i can't turn it on. I have read and tried everything but nothing works. Please help.