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do the buttons on the inside work? if so maybe you dammaged the video cable to the screen. if the buttons do not work then the phone isnt recognising that you have opened it. does the external screen go blank when you open it?
If formatting your phone doesnt help there are three possible problems in order of priority (1) your screen is gone and needs replaced (2) your ribbon cable is gone and needs replaced (3) phone needs flashed, I have repaired the first two above on many samsungs with this fault! Not an easy job! Hope this helps.