I will be playing a game. After 30-45 minutes, my monitor displays "no signal" and the audio repeats the last millisecond until I turn off the computer using the button. I have tried messing with the cables, nothing happened. Funnily enough, this once happened while I was Skyping and I was able to continue to continue the conversation without a problem (only my game audio had glitched out, Skype worked and my USB mic continued to function). But according to him, I had left the Payday game I was in.
This is not an overheating issue. I played TF2 (one of the games this occurred with) for about half an hour with a temp reading program open and task manager. My processor never went above 50% and the temps were slightly below 50C the whole time (I quit after half an hour, I didn't crash at that time). All of my drivers are up to date, all of the updates from Windows Update have been installed and the computer is otherwise well maintained. This computer was used by my mother to play Sims 2 and 3 and she never had any problems whatsoever playing them. It was passed directly to me and the only changes I made before installing my games was uninstalling hers.
I have played TF2, The Forest, Gmod, and Payday: The Heist on this computer. It has happened with all of these games except Gmod, but I only played that for about 10 minutes.
What is wrong here? And how fix?