hi guy, I use kali 64 bit and i have Ge force GT 620M on my laptop !!

I install nvidia driver following this :

apt-get update && apt-get install -y linux-headers-$(uname -r)

sed 's/quiet/quiet nouveau.modeset=0/g' -i /etc/default/grub

update-grub
reboot

CRTL+ALT+F1
service gdm3 stop
chmod 755 NVIDIA-Linux-x86_64-310.44.run
./NVIDIA-Linux-x86_64-310.44.run

Now reboot,then reboot i have the black screen, then i type control+alt+f1 and type : nvidia-xconfig

but I always have the same Black Screen when reboot !! why ??