Galaxy Note 3 Screen Black out problem. topic

Guys,

I just dropped my Note 3. It has a caselogy case on it but the screen went dark after got dropped. The screen has not cracked or anything. I can hear the notifications. I can even pick up calls by guessing the unlock swipe on the screen. The screen stays black or I see lines some time.
Can you gurus help me figure out what could be the problem ?

Thanks in advance.