Question My pc is not working

Aug 13, 2019
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I just assembled mono cpu cpu fan psu and gpu card and ram but it is not working
Th e cpu fan not running ,gpu fan run 2 sec and stop when I turn on .psu fan work very well.green light as normal on mobo.no boot ,.
The mobo asush81m plus
Cpu Intel core i3 4 gen
Gpu dont have any pci 6 socket
Ram 8gb
Psu aerocool m x 500a
I want to ask which component is dead
 

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