PC doesn't turn on

[GiackyXX]

Hello.

I just finishing building a new PC, but I have a problem: it doesn't start at all. Basically I press the power button and nothing happens. The only thing on are the motherboard LEDs that light up red as soon as I turn on the power supply. The motherboard also doesn't include a PC speaker. I already tried checking all the connections, swapping cables, running just with motherboard and CPU, but nothing worked. I also tried connecting the two power switch pins with a screwdriver as it's the first the solution that I found looking online, but that didn't work too. Unfortunately, it's my first build, so I don't have spare parts to test around with. Here's a list of the components:

 

-ASRock B450 Fatal1ty Gaming K4

-Ryzen 5 2600X

-Stock cooler (AMD Wraith Spire)

-G.Skill Aegis 32GB (2 x 16) 3200MHz (I also tried using just one stick and every single slot combination possible)

-Inno3D GTX 1660 Super

-Sharkoon WPM Gold Zero 750W (semi-modular)

-Cooler Master MB500 TUF

-Seagate HDD 1TB 7200RPM

-Crucial SSD BX500 240GB

-Wireless Net Card

 

Do you have any idea what could be causing this issue and what can I do to fix it?

[GeoHandle]

Does your motherboard have only the one light or are there multiple?

 

[Lorant]

I would personally take it ALL apart and rebuilt it, double checking as you go.  

 

Did your PSU come with a tester thingie?

[GiackyXX]

I took everything apart and started from scratch and, luckily, it worked flawslessly. I don't know what was wrong, but I'm glad there are no defective parts. Now it seems that everything is working good and so far I didn't encounter any other problems.

Thanks guys