Device was dropped and now the screen is black

the digitizer only has a small hair crack and thats about the only visible damage. I opened it up and resat the lcd cable but still nothing. theres some discoloration marks on the lcd itself (not sure if thats from me or not though) which I tried to get off with a dry microfiber cloth if that means anything. any ideas? I have a replacment lcd coming so I'll try that when it arrives. in the meanwhile any suggestions?