Ok, so this just happened to me like 30 minutes ago. I recieved a text message from my friend, and i replied to it. After a couple minutes, i went to turn it back on to see if they had replied, but it wouldn't show anything. I pressed the top button and the circle button, but the screen stayed black. I know my phone is on, though, because when i plug it into the charger, it vibrates... the screen just won't show! I really have no idea what to do! It also isn't working when i plug it into my computer. If you could help me i'd appreciate it very much thank you.