XT 910 Broken display and short circuit

Really that happen with my XT910. I explain to you, I was updating of Android 2,3,6 to 4,4, everything was all right, but when the reboot did, the phone was been frozen in the logo of start screen by more 1 hour. I tried to remove the battery, in this action, I touched for 1 second or less, the screw positive with the chassis. At the moment turn off. Next I finished removed the battery, but maybe for the pressure that I did, the display on the inside suffered 2 cracked when I went back to mount the battery and I tried to turn on it, only the phone heated up . After the event, I do not know if has only broken diplay, if I must give charge to the phone, if the phone have any protection, if the motherboard or the battery have put on short circuit. Thank you very much beforehand.