So I had about 40% battery and I had decided to turn off my phone because it was running slow!! and when I went back to get my phone to turn it back on it wouldn't turn on at all. This has happened to me before and I was able to turn itback on. But now it wont turn on at all. when I plug it into the computer I have a solid white light and when I plug it into the wall the light goes off/ Is there any suggestions on how I can fix my phone, im a student and cant afford a new phone I need HELP!!