I have an A855 that worked great when I bought. A few days in, I cracked the screen. After ordering a new screen I followed the directions of a youtube video to replace it. After putting it back together, it will not turn on when I press the power button. If I plug it into my computer the usb light comes on and the backlight lights up but that is all I can get to happen. Did I maybe mess up my lcd, or do I have bigger problems?