PC Upgrade No Display

I've been sitting here for hours trying to figure why I'm not getting any display on my monitors. I've tried different RAM and a different GPU. The PSU is from my old PC which worked fine. Please any help would be much appreciated.

Old PC: Mobo - ASRock A320M-HDV CPU- Ryzen 5 1600 RAM - OLOy 3000Mhz 8x2 1tb HDD 250gb SSD for boot up PSU - 600W 80+ Bronze GPU- Radeon 480RX 4G

New PC: Mobo - Gigabyte B550 Aorus Elite AX CPU - Ryzen 5 2600x RAM - Crucial Ballistix 3600Mhz 8x2 1tb HDD 250gb SSD for boot up PSU - 600W 80+ Bronze GPU- Radeon 480RX 4G

I'm keeping everything past the RAM from the old PC to the new one.