Black screen and pulsing blue led

This can be a rather tricky repair as the mental frame has to get pushed out from the rest of the mid frame which holds the OLED screen and other components. It is very likely that the Oled panel might have sustained damage but I would look closely around the edges or check the connector. If you hear sounds when connecting the charger or when getting calls then it's likely a display issue. If you don't then it could be the contacts for the power button arnt touching the motherboard.