[SOLVED] New PSU, when presssing the power button all fans turn on but then immediately shut down.

Apr 15, 2021
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MOBO RGB lights turn on but nothing happens on the CPU. We've checked all connections on the CPU and sata cables and everything looks to be plugged in correct.
SPECS:
Z390 gaming MOBO
CPU: Intel i7
H100i AIO pump
PSU: EVGA 850 gq

The power light on the header stays on after pressing it but nothing boots.
 

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