Question

Motherboard lighting up, Fans too but Then The pc shuts down

I just Builded my First pc with all brand new components, when i switched the power supply botton to on the motherboard lighted up and Then i pressed the on botton, the Fans moved for a Second and Then they stopped. I have Nudel on what to do, I have been trying to solve this For the last 4 hours with Other videos but with no success. Btw. I have Never Used Then pc before, that means that this happened the First Time i turned it on.
These are my components.
CPU- amd 5 2600
GPU-msi rx 580 oc 8gb
Psu- corsair rm550x
Case- coolermaster lite 3.1tg
Motherboard- b450m a/csm
Ram- ballistix sport 16 gb ddr4 3000mhz grey color
Fans- 3 x arctic 120 mm fans
Ssd- adata su800 256ssd
hdd.-seagate barracuda 2 tb
Thanks in advance.

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Re: shutdown

This can be any hardware component that fails or any bad detail while connecting everything.

Start with the minimal configuration (PSU, motherboard, CPU, 1 stick of RAM, outside the case, on cardboard), monitor connected to HDMI, keyboard connected to USB). That should give the usual BIOS displays followed by an error message about not being able to boot.

I assume you installed the CPU with the right quantity of cooling paste and vent.

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Yes I did

I installed the cpu with the already pre installed Amd paste. But I don‘t understand why a component would fail if all the components were new.

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New is actually more likely to fail. Here's why.

In reliability studies you run into The Bathtub Curve in your first or second class.
https://en.wikipedia.org/wiki/Bathtub_curve for those that need more detail.

Your most reliable PC is a few months old where you are getting out of the new failure rate time.

-> But what to do now? MAKE IT SMALLER.

We don't need all the drives, the case or much more than the motherboard, PSU, CPU+HSF, one stick RAM and GPU to do a test to see if the basic parts work. At this point we are looking at a working set ready to go into the case or we are looking at bad or badly configured parts. It does not tell us which part failed.

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I tried that

I took out my motherboard psu and cpu and put it on a cardboard and then only connected the cpu power cable and the atx power cable, the motherboard lighted up but when I turned the system on with the pins with screwdriver nothing else happened.

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