Question PC wont post but fans spin for a second on upgraded build.

Feb 16, 2022
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Hi!
I recently upgraded my PC's motherboard, CPU and RAM and it wont post.
The CPU, case and GPU fans spin briefly and then it dies.
I have rebuilt it 4 times by now and no progress.
Fairly certain that the cables are working and in the correct place.
You reckon its a hardware problem or what should be my next step troubleshooting this?

System:
Ryzen AM4 5600G
ASUS A520M
2x8GB Vengance RGB pro
620 W psu
GTX 970
 

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