Question PC not POSTing ?

[amir.sta]

Hi everyone
I have assembled the following system, but no matter what, it neither posts from GPU's HDMI nor the motherboard's VGA.
I have tried two different graphic cards (1660ti and 3070), so I'm sure the issue is elsewhere.
I also changed the location of memory, and that didn't change anything neither.
The build is:

CPU: AMD Epyc 7742ES
MB: ASRock Rack ROMED8-2T
Memory: Kingston KSM32RD4/32MEI
GPU: RTX 3070

Here is a video of debugging screen.

Any advice or suggestion on what the issue might be and how to solve it is appreciated.

 

[rgd1101]

7742ES engineering sample?

 

[amir.sta]

Yes, Engineering sample. I just restarted the bios, and it now works fine. You should let the countdown finish the first time, and it works just fine after that.