I was watching a video, and the screen, slightly faded, then went black, now it won't turn on, before when I'd turn it in, it would vibrate, now it won't even do that
I've had the same problem. Force turn off your phone (take out battery or hold power button twice) and reboot. Don't leave the brightness at whatever level it was when it did this. Deal with that for a while, then go back to the previous brightness. it should be fine.
