First PC Game Problems

###Troubleshooting Help:

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PCPartPicker part list / Price breakdown by merchant

Describe your problem. List any error messages and symptoms. Be descriptive.

So I've been trying to game on my new PC that my friend helped me build on Saturday. I've finally had a chance to and so I tried games such as Overwatch, Siege, and WOW to see temps for my cpu and gpu, but after about 10 mins, my games close out or my PC (just recently) was on siege and turned off and back on. I don't know what to do.

List anything you've done in attempt to diagnose or fix the problem.

I've only tried uninstalling and reinstalling games to see if there was a corrupted file maybe, but no luck.

Post relevant photos of build/parts here.

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I really would like to get my PC going to start gaming, but it's hard for me to tell what something is since I'm still very new to the PC world and such, so I apologize if I don't quite understand right away.