motors won't start

Hi all. I haven't used my Phantom 3S since the last two updates (about a year). I have taken it out to fly again. First I charged all the batteries. Then I updated to the latest firmware and the installation checked and said I had the latest version. Then I re-calibrated the sticks and IMU and...

my phantom 4 was working perfectly fine but i decided to change the shell , that was a mistake. After i changed the shell and put it back together i tried to arm the motors but nothing happened , the less are also not working . the camera is working but nothing else. in the app it said almost...