Pc keeps on restarting

[KENBAL420]

So a while back my PC had this issue where it would boot up and then switch off after 2-3 seconds and then go into a never ending cycle of booting up and then restarting. 

 

I obviously unplugged everything and tried again with only the PSU plugged in and the problem still occured so i started removing my RAM on by one and testing each stick and slot and still nothing. I removed the GPU and switched over to onboard graphics and the problem was still there. I Opened the case and started to remove drives and fans one by one to maybe eleminate the faulty hardware but still with only one ram stick, CPU and mobo it still kept on going on and off, i then took everything out the case and tested it outside of the case and then after the 3rd reboot it booted up again so i then checked for any damaged areas on the mobo, removed the cpu and checked for bent pins maybe but i didn't expect any because the PC was running fine for months. I then proceeded to wipe the mobo with rubbing alchohol to clear any dust build up or so and then tested it again outside the case and then it booted. I started to put everything back in the case and also improved my cable management and installed all the other components (all the other components was tested in another PC and everything was fine). The problem went away and i still don't know what caused it, after moving and so i set up my PC again and all was working well for 3-4 months. I bought a UPS because we issues with power outages and so on and i usually switch it off when going to work otherwise it runs with no one there and then sometimes when switching everything on the PC does it again and then after the 5th or 6th try it goes away so i'm really confused and frustrated because i can't afford a new PC now and i still don't know what's wrong with it

 

My specs are

CPU: i5 4670k

RAM: Generic 4x4GB

MOBO: Gigabyte GA Z97P-D3H

GPU: Gigabyte GTX1060 G1 Gaming 6GB

PSU: Antec HCG 650watt

UPS: Mecer 750kva (i think)

SSD: Gigabyte 240GB

HDD: 1x 320GB Blue WD

          1x500GB Blue WB

CASE: Cougar MX330G

 

none of the parts have a warranty except for the PSU, SSD and my peripherals

Edited March 3, 2020 by KENBAL420

[Anghammarad]

Try out another PSU... Systems that did behave like that in my work environment usually had a faulty and old PSU...

[KENBAL420]

9 minutes ago, Anghammarad said:

Try out another PSU... Systems that did behave like that in my work environment usually had a faulty and old PSU...

Already ruled the PSU out, Tested all components with other parts and so on.

 

The PSU is barely a year old and is working find in another system.

Edited March 3, 2020 by KENBAL420

[Anghammarad]

does the other system have the same power requirements? or does it need way less juice?

[KENBAL420]

way less juice but even the system i run now the 650watt is OP