PC shuts down while gaming!

[Nandvar]

So basically my pc is shutting down while gaming. Before you guy ask for the temperatures [cpu max ~60, gpu max ~60]. So i figured it could be the power supply! 

 

There are two scenarios I've noticed:

 

 1) PC shuts down fans keep running. (I have to reset the system)

 

2) PC restarts. 

 

I am not sure what is happening, any ways to check and ANY SOLUTIONS please?

 

Thanks!

 

 

• CPU
  i7 4790k
• Motherboard
  Asus maximus 7 hero
• RAM
  Corsair Vengeance 16GB
• GPU
  Asus 780 Ti DC 2 OC
• Case
  Corsair Air 540
• Storage
  Samsung EVO
• PSU
  RM1000
• Display(s)
  Samsung 32'' LED TV
• Cooling
  H100i
• Keyboard
  TVS gold-e
• Mouse
  Razor Deathadder

 

[Fate]

Test after every step

If you have another power supply laying around, use it.

Back up and remove all overclocks. 

Run a memory diagnostic test (like memtest 86 or prime95), if you quickly get a system crash, remove one stick of ram at a time and test again to see which stick is faulty. Make sure to mark your ram sticks. 

Try a different graphics card if you have one, if not, you can use on-board graphics. 

That's all I can think of, probably not the best order but you can start with whatever is easiest.