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Custom Built PC Not Running

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As title suggests my custom built pc is not running. I built this PC around 4 years ago and it had been running fine until 1 day i woke up and it didn't start. I began troubleshooting what the problem was by replacing parts and checking what was causing it not to run. As of right now i have replaced pretty much replaced every part of my pc:

Began by replacing PSU as i believed perhaps a power surge may have occured.
Secondly, replaced the motherboard because after I brought it to a shop to be repaired they suggested a new motherboard.
Thirdly replaced the CPU.
I have also switched RAM with different sticks in the different slots on different motherboards.

Each time I try power up my system, the fans run for a split second and then cut out. I have removed my GPU completely from the system so I don't believe that that is the problem or that it is relevant (did similarly with my cpu cooler in case it was somehow shorting the system) Anyone have any ideas what the problem could be? I'm truly out of ideas...
 
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