Folks here is the story: 1) The factory 256 GB SSD in the system failed and was throwing errors in the diagnostics, would not boot, and would not let me backup data from it. 2) I purchased a replacement SSD which is an Intel (SSDPEKKW512G8XT) M.2 SSD device. I installed this drive and booted into the Windows 10 installation and it detects the drive and allows me to install windows onto it. 3) The problem is that the system will not boot from this drive. After further investigation the BIOS reports that no drive is installed (miniCARD SSD device = none). Also, when I try to run the dell diagnostics on the system I get an error that no drive is installed in the system. 4) I have updated firmware on the SSD and on the XPS 13 system so they are both currrent. I can't understand why the system doesn't think the drive is installed but when I boot Windows from UEFI off USB it can see the 512 GB SSD and write a windows installation to it. Anyone have any ideas here? Are there only certain M.2 SSD that are compatible with the XPS 13? TIA