Rog Dark Hero Z790 - I can't have my USB Expansion Card Detected on the PCIex4 Expansion Slot

[dwain]

Hello,

I have my RTX 4090 installed on the PCIex16 slot. I didn't attach any M2 to my Gen5 port due to not loose 8X for the GPU. So I installed 3 M2 SSD's on my Gen4 M2 slots. Today I installed one expansion card on the PCIex4 slot which is an expansion slot. I booted the PC but windows didn't recognize anything. 

I don't remember well but if I'm not mistaken I used the marked M2 slots for my M2 drives in the picture. Does any of these slots a bandwidth or conflict with the PCIex4 port? 

Or do I need to do something else in BIOS maybe? 

Thank you very much in advance. 

[dwain · Accepted solution]

I found the problem. It was my fault. I didn't attach the SATA power cable to the extansion card. Once I attached all started to work.