samsung galaxy s3 screen not working. help urgent!!

Hello. My samsung galaxy s3 screen is not working. like the phone turns on and i can hear the sound when samsung logo comes. and i can also hear other sounds like messages and etc but the screen is black. sometimes the screen turns on after i tap it 3 or 4 times. but it gives a greenish display on the half screen. please help me with the problem and its solution.

Maybe try rebooting into recovery mode and performing a factory reset.

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