Question PC still won't start after the PSU was relaced

Dec 30, 2021
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I recently built a PC with help from on here. Then the PC made a loud pop noise and wouldn't start I tested the PSU and it was dead and I got a rma for it and I received a new replacement yesterday. I just installed it into the PC and now the PC still won't start. Please help what could be the problem now?? Thank you
 

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