Ubuntu boots in black screen

as the title says, Ubuntu 14.04 boots into a black screen. I have ubuntu installed alongside windows 10. I had problems with the nouveau driver, but i managed to install my Nvidia driver (GTX 950M).After this it worked and I installed the gnome desktop, it worked after this too. And it worked for a while, but now, out of nowhere, it just won't boot. It shows me a black screen. I tried the recovery mode, and i only managed to enter the console .I pressed alt + F1 , F7, nothing changes. :)