Question Power to the Motherboard, but won't boot?

Feb 3, 2020
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Hello all,

I recently upgraded my PC with a new GPU, CPU, Motherboard and RAM. After installing them all, my PC booted for a second, shut off, then booted again. After cutting it off I moved it to my desk, only for it to not turn on at all. I've made sure all of my connections are seated properly and reinstalled all of my components but still nothing. There is power to the motherboard, indicated by it's LEDs as well as the power switch LED on my case's front panel, but simply won't work. What course of action should I take?

ROG STRIX Z390-E Gaming
EVGA RTX 2080 Super
I7-9700k processor
2x8 GB Corsair Vengeance LPX 3200 DDR4 memory