Go back to factory conditions. If the same happens then, it's a warranty issue.
Of course, this shouldn't happen with an official verson of Arma 3. But it can happen with a cracked version. In that case: don't do it. If it happens with an official and paid version or Arma 3, first ask their customer service, and if that doesn't help, it's back to the shop and complain.
My computer, every since I downloaded Arma 3, keeps randomly black screening when opening games or anything else really and requires a hard reset to make it work again. I don't know why it's still doing this. I have since uninstalled the game even though this computer is meant to handle big games like Arma. I heated updating the Display adpapter works but I tried that and still have the same problem. My computer is only 2 weeks old. Please help!