Help with PSU
Based on your system specs I don't beleive your PSU has enough oomph to turn the PC on. When the PC is first turned on there is a momentary power spike as the PC draws maximum power for a few seconds. Your PSU may be coming up short. This may explain why your last PSU worked while your newer lower wattage PSU does not.
If you input your parts into a PSU calculator you will find that the recommended PSU wattage will be 750 watts for the entire system.
I recommended buying a 750w 80+ rated PSU and trying again.
The ryzen 5 is a very efficient CPU. Its only 65w TDP. Most of that power draw is coming from the 3060 ti GPU and the rest of your stuff.
MSI seemed to be the nicest PSU calculator i could find. There used to be one called extremeoutervision which was everyone's favorite but it is no more.
https://www.msi.com/power-supply-calculator
This calculator didn't have your ryzen 5 4500 so just input the 5500 instead. It has the same 65w TDP. See for yourself.

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