I found the problem. This Asrock industrial board boots just fine without X710-DA2 plugged in. The NIC is x8 and was working fine. I don't know what's the reason it refuses to work in x16 slot in this board.I just bought Asrock Industrial IMB-1230 and got into problem. Initially it can't boot with 13th gen and I had to borrow a 12th gen to upgrade BIOS. Now the 13th gen CPU can boot into BIOS just fine but can't boot into any drive, including UEFI flash drives.
Specs say DDR4 3200 SO-DIMM but i'm running on single SO-DIMM stick of DDR4 2666. It shouldn't be the problem, right?
I think there's a bent pin in the socket, but since CPU can go into BIOS it also wouldn't be the cause.
This X710-DA2 is working with other boards. Other NICs, including old Mellanox ConnectX-2 cards, boot with this IMB-1230 board. But 2 of them does not boot together.