I just got an Asus Strix B650E-I ITX motherboard, Ryzen 7800X3D and 32GB of DDR5. I can't boot at all. Every time I get 1 long beep and 3 short and a white colored Q-LED. Both indicate no GPU detected according to the manual .
I've tried:
1) reseating The CPU, GPU and RAM
2) switching between a 4070 and 1070Ti, (both work in an older system)
3) using a different power supply, (which works in an older system. )
4) Clearing the CMOS.
5) inspecting the AM5 socket pins for damage, (there was none)
6) Adjusting the heatsink mounting pressure up and down.
I am officially out of ideas.