pci e

Hello. Yesterday, I bought an Asus RX6600 Dual. So when I got home with it, i inserted it into a PCI-E slot, plugged power (1x 8-pin) and a working HDMI cable. At first startup, it was detected but not working. The VGA LED on my Biostar B550MX/E Pro did light up. I know it's not the CPU/RAM...