cpu wont post

Ryzen 5800x won’t post. Everything else turns on. Fans spin, AIO pump works. I get a black screen and the red light on the mother board. I’ve tried updating the bios twice. System info Ryzen 5800x B450 Tomahawk Max (bios ver 7c02V3A. Also tried BIOS 7C02v3F) 16gb (8x2) Corsair Dominator...