Strange white stripe with green dots at the right

[Santiago_18]

Hey guys. I've really been taking hell from this pc. So long story short I took it to this technician guy who managed to make my pc read my graphics card again (gtx 570) and all cool from there that was today however I was playing Rome total war 2 and all of a sudden my screen goes dark (game still running in the background) so I turned it off and back on but after startup I got this white blank line in the middle of the screen with some little green dots on the top right of it.
I'm really stressed about this whole thing there has been just so much going on with it and to this point am honestly about to throw it thru the window. PLEASE HELP!

 

[hang-the-9]

First make sure it's not the monitor or cable, past that it's probably a bad video card. What is the power supply brand and model? A lot quality one can cause all sorts of issues.