Probaj ovo sto jel lik napisao ovde https://steamcommunity.com/app/730/discussions/0/1843493219431228719/
The only clue I got from forums was that it must be some process or notification that keeps poping up for less than a second thus not letting us notice the process and kill it. So, what I did was to kill explorer.exe from task manager and exit all apps on frontpage other than cs go to make sure that there is only cs go on alt+tab section. I launched the game and it suddenly switched to black screen (instead of empty desktop), so I pressed alt+tab and saw that there is one more app running but it cannot be opened thus causing black screen. It was RAVCpl64.exe (realtek hp audio manager) in my case. Now I have the name of the processor that causes the issue so I disabled it from the startup menu and everything went well.It could be a different process for you so check it out.