For your new Processor to be recognized by your Asus Prime X570 Motherboard you MUST have BIOS version 2606 or newer installed. https://www.asus.com/us/Motherboards/PRIME-X570-PRO/HelpDesk_CPU/
Asus Motherboard shows what BIOS version you have installed on the Motherboard from the factory. You probably going to need to remove the CPU Cooler to see a long thin white label next to the CPU Socket. Look for BOH: XXXX on the label. Probably the second line at the end. That will the BIOS version you have installed.
If BOH: is lower than 2606 you must first update the BIOS Version to 2606 or newer for your new Processor to be recognized and able to boot up.
Once you install the correct BIOS Version then it is a good chance your RAM issue will disappear unless you have a defective Motherboard or you have incompatible RAM installed.
Unfortunately, Your Motherboard doesn't come with the BIOS FLASHBACK feature which is a button on the rear of the Motherboard where you install a USB Flash drive with your BIOS Update and it will update the BIOS on the motherboard automatically without booting up.
So now you are going to need to find another Ryzen CPU that is supported by the BIOS version you have installed to update to BIOS Version 2606
But if the BIOS on your Motherboard is version installed is 2606 or newer than you may have a defective Hardware issue like a bad motherboard or RAM or CPU etc.
I would install a small BEEP speaker so you can listen to the BEEPS it makes while trying to boot up. That will confirm your LED Trouble code.