Thanks to everyone who provided information to resolve my “M.2 NVMe SSD” boot-up issue.  I purchased a Crucial P5 Plus PCIe M.2 SSD so I decided to contact them.  They referred me to this article, which solved my Boot issue “PCIe SSD Not Booting After Cloning from SATA SSD/HDD”. Link – if you’re interested: [URL] Simply stated - my issue was corrected by booting the new P-series SSD into Safe Mode which loaded the correct drivers needed to boot Windows normally (step by step details in the article above). Thank to everyone who assisting me. Richard
I have a Dell XPS 8900 Tower with SATA HDD (1Gb) purchased in 2016 (up graded to 1 Gb SSD via SATA years ago). There is no M.2 NVMe SSD installed on my computer, but there is an empty M.2 slot on the Mother Board.   I want to install a new M.2 NVMe (1Gb) in my unit to gain the speed.  I will use a PCIe x16 adaptor as well.  I CAN’T GET THE COMPUTER TO BOOT utilizing either the M.2 mother board slot or the PCIe x16 slot.  I have cloned the M.2 SSD three times (twice with Acronis and once with Macrium Reflect).  After the cloning it will not boot.  When I boot from my old SSD via SATA interface, I can see the M.2 drive in Disk Management.  I have read numerous posts on the Dell Community forum trying to get a clue as what I am doing wrong but have not found anything that works.  I am not technically savvy when it comes to advanced computer technology, but I have tried several of the boot suggestions with no avail.  Moreover, I have seen where there is no shortage of people like me with similar problems, and some that have resolved their issue.  It seems clear to me that I should be able to configure the computer to boot from the M.2 NVMe SSD.  Any suggestions would be appreciated. Thank you. Richard
XPS 8900, BIOS boot from M.2 or PCIe x16?