I installed Ubuntu a few days ago, and decided to install Steam. After installing Steam, I downloaded Metro: Last Light. Using the open-source driver, I got a black flash, and the game would close, so I switched to the Nvidia 319 (proprietary, tested) driver, and I got a black screen when I attempted to launch the game, so I rebooted. Now, when I try to boot into Ubuntu I get no display output. I've had something similar gapped before when I installed the Nvidia 331 drivers, and I am getting quite annoyed with it. I have a 1440p monitor running over dual-link DVI from my GTX 780, my processor is a 4770K, I have 16GB of DDR3-1600 C10 RAM, and I am using an old 320GB Caviar hard drive for my Ubuntu drive. I have 64-bit Ubuntu 13.11.0-15 installed. Any suggestions are appreciated. Thank you!