The monitor goes out and turns on

The people may have come across this or understand.
I have such a problem, I play a game, I play the game, while I’m sitting in VK or YouTube, the screen turns off for a second and turns on again when I play this does not happen at all.
I thought it was a matter of the wire, because from vidyahi to monica the cord, on monica, was not fully inserted if it turned off a little, because of this? while correcting I observe what and how