b550 aorus master

Hi. I'm new so pardon my candor, I wasn't sure what category to put this under? I figured 'systems' since that what I'm discussing here. First, let me amuse You by saying that you're not going to believe how this happened, but it did. I've been working on updating my new system all day, but I...

I had another mobo (Asus B550M TUF Gaming PLUS Wifi) and I accidentally busted the first PCI E slot, so I got another mobo, a B550 Aorus Master. To my surprise, the first slot on this new mobo doesnt seem to work. Switching to the second does the trick. At first I thought it needed the bios...