motherboard – replaced MB, CPU and RAM but my PC still does not turn on, the GPU simply blinks

So I had a problem that at some point I unplugged all the peripherals from my PC when I was getting ready to move. Then, after I reconnected everything, it did not turn on and the green light of LED 1 on my GPU was blinking. I put it into service and they told me to replace MB. I bought new MB, CPU and RAM, I installed everything but I still get the same result. The CPU power test proves that it works. How can I solve this problem?

MB: X470 Aorus

CPU: AMD Ryzen 5 2600

RAM: G.Skill Ripjaws DDR4 8GBx2

GPU: GTX 760 from Asus

Power: EVGA SuperNOVA NEX750B 80PLUS