I built myself a PC a while back with an NVIDIA Geforce GTX 780 card and Window 7 64-bit as the OS. The video drivers are up to date There are no problems when playing games like Heroes of the Storm or Ori and the Blind Forest. However, when playing Rebel Galaxy or Assassin's Creed: Syndicate for a few minutes, the monitor remains on, but ceases receiving anything from the computer and the computer ceases to be responsive, although it does not restart or shut down. This can happen even when Syndicate is simply paused. When this occurs, sometimes fans in the case go loud, but sometimes they do not. I cannot get the computer to experience problem on demand, but it does not seem to be a temperature problem unless there is a sudden spike in temperature immediately before the issue occurs. What are some things I can do to try and suss out what is collapsing?