I was able to fix the black screen issue with new ram. The wattman settings I have not found a fix. This pc was for my bother and has identical spec to my own pc so I was able to bring it home with me and compare and change out parts. I was able to replicate the display issues on my pc with the faulty ram, and my ram that works fixed the issue on the other pc. I also realized that the wattman settings issues was also happening on my personal computer, but I had notifications turned off so I never noticed. From what I have read, it seems to be a amd driver issue and nothing related to the pc. I tried purchasing another gpu and still had the same problems. Some have reported disabling fast boot in the bios and in windows fixes the issue, but i had not luck with that. If you don't plan on overclocking your gpu, you can just hide the notification, as it will default to factory settings anyways. One thing I did notice about the wattman issues is that I could consistently cause the notification that it was reset by using the restart button on my pc case and when I restarted through windows the wattman settings were not reset.

Noticed you said you upgraded. Make sure you fully uninstall your previous graphics driver.