My iPhone 4 was lost. I have activated lost mode. Now i got it back and put pass code; it opened but screen is black. What can I do now?

My iPhone 4 was lost. I have activated lost mode. Now i got it back and put pass code; it opened but screen is black. What can I do now?

All you can do is forget it and learn from mistake, go buy new

Try taking it to an apple store. IF it can be restored, and I don't know that it can, they will know how. The purpose of 'lost mode' is to ensure the average person CAN'T access the phone, even with the password.