I dropped my Samsung Galaxy S3 on its screen on a concrete slab. I dropped it before but never on its screen. It already has cracks but they were there before I dropped it. Now the screen won't turn on. I hold the power button to turn it on and I feel the vibration but the screen doesn't light up. The back arrow and the settings button beside the home button light up when it reaches the lock screen. That's about it. Please help me fix this problem