Kali Linux Stuck at Booting

i have problems with booting into kali linux.

it worked always fine im using a live usb persistence.

but last it crashed or somthing like that i can log in and i stil get a strange message so i have reinstall kali linux 2.0 but now i cant even boot into it . i get a black screen with a this " - "

can please sombody help :)

p.s. sorry for my bad english