As soon as you post the exact Make & Model of your Motherboard I will be able to answer your question otherwise go to your motherboard's Support site and look at the CPU SUPPORT LIST and see which BIOS version you need for your Ryzen 3 3200g to be recognized and to boot your computer up.
Could also be incompatible RAM MEMORY so I would remove all RAM sticks and just install one RAM Stick and see if it boots up.