If on you should turn it off immediately and not restart again until after you have put it in a baggy of rice for 2-3 days. That might be your only hope, though it sounds like you have started it already since you know the screen doesn't work. It may have irreparable damage already. Give the above rice baggy a try though.
The top half of my iPhone is still not working. And I pit it in a bag of rice already nothing happened. I font know what type of iPhone it is all I know is that it's old look! And I saw some videos and it says that I have to open it but it doesn't have anything unscrew . Is there any hope HELP ME!