PC shuts down randomly when playing games

Trev6450w

Commendable
Dec 30, 2016
40
0
1,530
I am not really sure whats happening. I built this pc like 6 weeks ago and it was working fine until now. It has been randomly shutting off during gaming sessions like H1Z1. My temps are pretty good i'd say, i am using an fx-9590 and cooling it is a h100i v2 and the cpu temps never go above 55 celsius and coolant temps never go above 45 celcius. My gpu temps on my 1060 3gb never go above 70 celsius. I feel like its between the gpu or psu. I have a refurbished evga psu but its gold rated... Sometimes the pc shuts off and restart buts other times the monitor, keyboard and mouse shut off and the pc remains on.

Here is my setup:
SSD: Faspeed F510 120G
HDD: WD GREEN 1TB
CPU: AMD FX-9590 Black Edition Processor @ 4.7 Ghz
CPU COOLER: Corsair H100i v2 Extreme Performance Liquid Cooler
MOBO: Gigabyte AM3+ AMD 990FX GA UD3 R5
GPU: EVGA Geforce GTX 1060 SC 3GB (single fan)
RAM: G.SKILL 2133 MHZ Sniper 8GB (2 x 4GB)
CASE: NZXT M59
PSU: EVGA-120-G1 80+ Gold 750w
OS: Windows 10 Professional 64 bit

Thanks.