Need some help on how to fix my K810i.

I had a little accident one day on work so I missed my telephone on the floor.
this causes the LCD display to crack and only blinking white light came on.

I bought a new LCD screen to my telephone and works fine but now when I try to start telephone I only get this blinking white light. Nothing else.

Anyone knows how to fix this??....Somebody talking about a service cable. what is that?..Is that this USB cable called DCU-65??...

I have tried a couple of programs like SE tool and XX++ but I can't connect to the mobile phone..

So please help me anyone......