Anyways, i've tried a lot and this only happened the first time like 1 week ago and it came out of NOWHERE.
In that time, i already reinstalled windows, which means i updated my drivers again to the latest versions.
I'll try verifying game cache integrity, but i'm afraid this won't work.
I played cs:go like 1 hour and i had the same problem again. My screen freezes and i can't do anything anymore except for turn on & off manually using the startup button.