computer randomly shut itself off

[TripZz11]

Help plz

Computer randomly shut itself off one day an since it wont stay on longer than about 2 hrs idle or shut off instantly if i open any games 

Temps monitored 24/7 on everything nothing exceeds 50's 
temps monitored on speccy cpu volts monitored on cpu-z both on second monitor while trying to find problem 
since it has happened i have changed Motherboard and psu have tried booting with 1 stick of ram at a time shut itself off still tried without gpu still same i am at the point i am about to but brand new 32gb 3200mhz ram new 750w msi fully modular psu just to have brand new ones i have reset windows re installed all drivers an software any help with it would be good i need to get it working again asap as it is the only thing i have to be able to do all my coding atm

specs
i7 6700k no oc Air cooled running 20* idle 50's gaming
z170 asus pro gaming Motherboard
gigabyte rx570 8gb 
16gb 2x8gb ddr4 2666 Geil evox ii
BX500 SSD 
WD 1000gb HDD
Tough power gold 750w PSU 
1 week old thermal grizzly paste on gpu an cpu

[therearebatsinmyass]

If you've ruled out every component in your pc, and it's not a software issue, maybe it's something else? It could be a faulty PSU cable or something stupid like that, just go over all components connected to the pc and see if that somehow fixes anything.

Either that or your computer is just cursed, also a possibility.

[TripZz11]

Yeah have ruled out everything i could possibly rule out without having anything other spare to try i know it was originally a power supply that died thats is why i did that one then it done this shutting down stuff so started going threw stuff an thought motherboard but wasnt that so now just thought start getting parts brand new bit by bit till one day it is a whole new build leaving cpu till last cause ofc if it come to that i will just get ryzen 5700x or something so new board again but will have all new other parts to go with at least