Dropped phone won't turn on

Best guess is something came loose on the inside and is now not operational, you could try to open it up and just get a visual on anything that might be out of place or disconnected, try re-seating everything, if that doesn't help the it will more than likely be the board

HI ! I had the same issue. I kept the phone in the freezer in an airtight bag for one hour and restarted. It worked !! (This was a method I saw in youtube videos) Hope it helps someone :)