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ROG DIMM.2 Expansion Card Causing Black Screen After POST

Level 7
Hello ROG Community,

I seem to be having an issue when booting up my computer from a shutdown state.

When the computer is in it’s shutdown state and then powered on, the computer will boot, POST and then start to load into Windows 10 when all of a sudden the display will lose signal but the computer will still be running. When I force shutdown and turn it on again it will boot into Windows 10 fine. (Please see attached video showing the issue.)

After some troubleshooting, it turns out that if I remove my ROG DIMM.2 Expansion Card that is holding my Samsung 960 EVO 1TB M.2 SSD it fixes the booting issue.

Would anyone know how I can have two M.2's running at the same time?
1x Samsung 960 EVO 250 M.2 SSD (OS) (Located on the Motherbaord)
1x Samsung 960 EVO 1TB M.2 SSD (Games) (Located on the ROG DIMM.2 Expansion Card)

I have the Samsung 960 EVO 1TB M.2 SSD in the slot M.2_1(SOCKET3) on the ROG DIMM.2 Expansion card. If I move it to the M.2_2(SOCKET3) Windows and the BIOS will no longer recognise it.

Please note: Nothing is overclocked everything is running a stock. BIOS Version 1603

EDIT: Would this be because of my PCIe Lanes being only 28?