Question No display

Jul 2, 2019
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Hi im new to this site and i have a very important question..

I bought a new pc case and when it arrived i was very happy.. but then when i transfered everything from my old case to my new case i had no display.. so i started troubleshooting but could not find anything so out of desperation i transfered everything back to my old case and then i had display again.. so again i transfered evrything back to the new case and did exactly what i did on my old case but then i had no display again.. so now in back at my old case again with this question.. how do i fix this cuz its very weird..
 

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