Screen goes blank during games - Video Inside

[davc123]

Screen goes blank during games suddenly but computer remains on

Video : at 0:58 goes blackscreen
https://www.youtube.com/watch?v=vrJmx8LI...e=youtu.be

listen 1:25 - 1:36 weird sound whole time while on black screen


my pc
http://imgur.com/3Od3LUd