I have Ubuntu 14.10 dual booting with Windows 8.1 on a Lenovo Y510P with a NVIDIA GT 755m graphics chipset.
I recently installed the proprietary NVIDIA driver version 340.65 on Ubuntu. After that I started getting "broken pipe" errors on the boot screen to Ubuntu.
Today while working on gedit, the screen froze and i had to reboot manually. but then instead of the usual user login screen, all I get is a dark screen and nothing else. Even the back light of the screen is off. Also, I know that the OS boots properly as I can hear the startup sound.
Any suggestions? Have a lot of data so... reluctant to re-install. :(