Question PC wont boot has no display

Dec 26, 2019
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I built this pc around april it was working fine about two months ago I stop using it and today it wont display a signal

Specs:
Mobo: Asrock b450m steel legend
Cpu: R7 2700x
Ram:corsair vengeance pro 16 Gb
Gpu: power color RX 580 red dragon

i have tried everything reset cmos,reseated cables,switched slots of ram single stick,tested a different gpu.
Everything I have tried I dont know what to do but i dont have any other spare parts to use.