Engine does not jump to fuel pump buzzes not

Hello dear Kawasaki friends, I have a problem with my Z750 2006. She just doesn’t want to start any more and you don’t get any more buzzing when I start the ignition. Short history. She’s been out more recently during the ride, too. And without any problems again. Now I’ve taught my neighbor to drive on a private property and of course he strangled the machine more often. After 15 min he had the shoot out and I was on the home eg. I drove about 5km then she went out and not to me any more. We tried to bridge unfortunately did not work. Couple of hours later the Kawa was back in the garage – was towed off. I jammed the battery and charged. Side stand checked for passage But unfortunately the machine does not start. Starter turns. If you had there some tips for me I would be very grateful to you