While checking my email, phone went to a green screen. to a black screen and then cut off. I shut it down and then tried to cut it back on, but nothing happened. I then plugged it in to the charger and the little white apple came up. I left it plugged in for about 20 minutes, but now the apple is gone and the phone won't do anything. I tried plugging it into the computer to see if I could restore it through iTunes, but the computer wouldn't recognize it. Any of you techy gurus know how I can get it cut back on?