Unexpected Shutdown especially when turning on games

My computer randomly shuts down and reboots by itself. It's usually unpredictable but inevitable if I turn on a video game. I don't see any BSOD errors but just to be sure I decided to follow the instructions here and post. I hope someone can help me find the reason behind the shutdowns. I'm willing to bet on a faulty power supply but I need to be sure before investing in a new one. Btw, Event...



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