i would be more inclined to blame an overheating/failing graphics card given the symptoms listed only include gaming, which is not THE most stress a pc will be under. given the monitor loses signal as well that seems the most likely case as obviously a graphics card will be under load during a game.
only happens when playin those 2 games, it lets me play anything else... overheating of graphic card maybe knwing that those are demanding games, as far as the graphic card handlin the game at all it ran them before with no problem,recently started doing it, i tried reformating and that didnt work
hate to hijack a thread but i am having the same problem could it be the opposite too cold? or is that just laughable? running about 24c computer by window in northest east