Question Motherboard doesnt work in case

Aug 1, 2019
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Hi guys.
I have a problem, probably case shorting motherboard. Everytime i start pc it just turn on fans on less than a second and its dead.
I installed new cpu cooler and when i put mobo back it didnt work. So i put it out, tried everything 1by 1 all worked, i even was in windows. So i thought i just didnt connect something well so i put it back in case, connected everything and it didnt work again. I rebuilt it 2more times again nothing. I tried different standoffs but it didnt work. What should I do?

if it helps
CPU Ryzen 5 2600, dark rock pro 4
GPU RX 590
RAM 16GB DDR4 @ 3200MHz
PSU EVGA 500W 80% eff
MB X470 gaming plus