I have a msi 560 ti hawk and before my computer was having random black screens and such. I RMA'd once but it didn't help much. The previous driver I had, the 285.62 from nividia updated to 296.1. It seemed to have stopped having black screens but sometimes my monitor would freeze and the screen was all distorted like, though the music that was playing in the background was still playing. Just recently when I was watching something I noticed that there were green dots appearing on my screen and as I continued watching there were more green dots. I stopped watching afterwords and went on to firefox and the top bars were black until i opened a new tab. The new tab made it back to what it looked like before but when I went to a website the colours were all over the place and in a thread as I scrolled down the words kept repeating. As I typed this the screen just went black too.
I also haven't overclocked it at all and it's 1 graphics card not in sli. My psu is 850 watts.