How to install Nvidia driver?

First of all after installation of Ubuntu 14.04 I was having problem - system freezes after few minutes of work.

I installed nvidia-current driver, it helped. I decided to install something more newer(I want to use GPU calculation with CUDA, finally).

I tried "additional drivers" 331. Didn't worked. Black screen after rebooting. I tried to install Nvidia drivers from offical site(last one, 346).

Also black screen or blank. Tried Xorg drivers - recommended 349 and 346. Same...Black screen.

I have GTX 590. I completely new to Linux, so getting lost in it. Why is it happening, whom drivers I should use and how to get it work?