Fried my PC on accident?

Dec 27, 2018
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I'm not sure what happened an I don't know how to fix the situation. I was applying a new set of thermal paste after I took off the CPU fan put it back on go to start my PC, an then boom nothing happens someone please help me troubleshoot what did I do wrong. Overnight I took apart everything an reaplied them to see if I could fix it. Nothing I do fixes it I even tried to reset my bios

Specs
Amd ryzen 5 2600
Xfx r9 380
Gigabyte a320m-hd2
Evga 500w