Thank you guys so much!
I tried what Glasskuter said and checked if I could disable the m.2 SSDs in the BIOS without removing them.
But for my motherboard apparently you can only disable one port - m.2_4
So I removed all drives except the main one and did a clean install. After that I added...
Thank you so much for your answers guys!
Then I will first try Glasskuter's suggestion and do a clean install with just the main drive.
I did not know that leaving in other drives could mess up the installation that much, especially since you could specify which drive you want to install Windows...
Oh, I also tried the obvious first step: removing the old 970 Pro drive and only leaving in the new Windows install on the 990 Pro.
But then I can't boot into Windows at all.
Hey guys,
I hope you can help me with this - let me first say that I just built my first PC (previously I only had already built systems that my siblings gave me after they got a new one) and I might not understand all the terms, so be patient when I have to ask for an explanation 🙈 (also...