faulty pc

Don't want to make this too long, but I built my PC in December 2018. Ever since I built it, I have never been able to play an intensive game without it crashing my PC (note that the crash happens after 2-10 minutes after launching the game). I have considered faulty parts as the reason, but I...

My components: i5 6600(nonk), 2x4gb ripjaws v 2400 mhz, seasonic m12ii 520 w, wd caviar blue 500 gb hdd My problem: My pc turns on then shuts down 3 seconds after. Plus it turns on only when it is plugged into the wall. Using the start button or even using a jumper cable for the pwr button on...