It happens to me very often. It is so frustrating. I did figure out that the screen can be open carefully anyway. Try not to push to hard when opening it, but dont do this if you have never done it before. You can also search on Google and watch some Youtube videos.
Try to open the phone and take a look inside (if you can screen replacement of course). If not, take it to a technician. Good luck, hope you`ll manage to fix it.