This didn't happen before applying Anniversary update. I talked with other people online and this problem happens for both AMD and Nvidia graphic card. I still cannot find a solution so can just turn on the DVR and have to restart CSGO sometimes to get through the FPS limit to 30 because of DVR problem. With black screen the computer seem like running 100% normal except the black screen part and I can turn it off by pressing power button once to order the windows 10 turns off and it sounds all normal with Windows shut down sound then shut off. The screen would be normal again once I turn the computer on again.