Hey guys. Iam from Czech republic, so sorry for my bad English, but noone at czech forums cant help me
But now lets get to my problem. My old graphic card has burnt out. So I've bought a new one, MSI GTX 750 Ti 2GB. And when I play Dotay 2, after +/- 15-30 minutes always happens this: http://s28.postimg.org/4vhlfq58d/10528163_751161194940389_718870622_n.jpg and the game crashes. Then my screen is black and it says that monitor is not connected. After a few seconds, game is down in windows strip and Iam back at desktop. Then i gotta to turn the game off with Ctrl+Alt+Delete. Sometimes, instead of these white squares my screen turns to orange or blue during playing and then I gotta restart my computer through restart button on computer. My friends don't know why does this happen, people in computer service doesnt know too. And Iam so helpless. Can anyone help me? do you have the same problem? Thanks 
EDIT: I can move with my cursor, but it got his own white squares around it (visible at picture I added)
EDIT: I can move with my cursor, but it got his own white squares around it (visible at picture I added)