Z97 Extreme6/Samsung EVO 960 SSD

nukEd wrote: All the same, even the system browser in UEFi won´t find the EVO. It says empty. Also the W10-Installation do not recognize it. I think that the M.2 slot must be faulty not the SSD, because it works fine in the normal slot.. Damn

I've never had a bad M.2 slot myself, and I have boards like the ASRock Z170 Extreme7+ that has three Ultra M.2 slots, and I've used them all at the same time. I've removed M.2 SSDs from the slots, put them back in again, and put different SSDs in the slots.

Of course it is possible for an M.2 slot to be bad, and it sounds like yours may be bad. If the 960 is not seen in System Browser, then it is not being detected.

The only things I can think of is if you are using multiple video or other cards in the PCIe slots, but that should not affect the Ultra M.2 slot. Otherwise, if something is shorting the bottom of the board right on the Ultra M.2 connector.

Did you try clearing the UEFI/BIOS with the jumper on the board, or the Clr CMOS button on the IO panel, with the 960 EVO in the Ultra M.2 slot?

The connections on any M.2 slot are tiny and very close together, a miracle they work at all. You have the 960 held in place with the small screw, right? Of course you do. There is some side to side movement of the SSD when it is in the slot, before the screw is in place. Do all the gold connection points on the 960, on both sides of it, look good?

First time I can recall hearing of a bad M.2 slot, which sounds like it is the case, sorry to say.