[SOLVED] Pc wont start when 8pin atx connected to motherboard

[yRA]

Hii guys first time poster looking for some help
So today when i was watching YouTube in my pc it suddenly turned off. So after trying to start it again it would turn on for a second or half and turn off again. After doing all the normal trobleshooting stuff i came to know that it only powered on when the 8 pin connector was not plugged in the motherboard.
I have already checked all the connectors are firmly connected
The pc is still new I assembled it in January of this year
My specs are
CPU - ryzen 3 2200g
GPU- gigabyte gtx 660ti windforce oc 2gb
Mobo- asus ex 320m gaming
Ram- hyperx fury black 4gb two stacks total 8gb ram
Stock cpu cooler from amd
Hdd- seagate baracuda 1 tb
Ssd - wd green 120 gb
Psu - corsair tx 750

So is it my cpu ?mobo?psu? Please help

 

[ChumP]

If it suddenly turned off, than most likely your PSU is the problem here. CPUs do hardly fail.
Can you test with another working PSU?

 

[yRA]

ill try using another psu tahnks for the reply