Hello,  That was a whole chain of problems. Dell support simply refused to provide any assistance, neither by phone, nor by online chat or opening a ticket. Very frustrating, it probably deserves a dedicated topic. But anyway, since I had no choice, I continued on my own. I was able to make it work by sequentially reconfiguring all related BIOS boot options and retrying installation and rebooting till it finally started to boot. I don't remember now what exactly solved that because when it started to boot reliably it revealed a next serious showstopper - Windows 2016 LTSB does not support that built-in Intel graphics adapter... Another round of shaman dancing around these PCs didn't help. This time I found no easy way to make the screen resolution larger than 1024x768. And, while investigating that, I discovered that December 2021 was the EOL of the 2016 LTSB... Taking into account the discovered problems (and not discovered yet) I gave up and decided to upgrade our mainstream OS to the latest LTSC. So, my recommendations: Best regards, Igor.
Hello, I need to install the Windows 10 LTSB 2016 (or Enterprise, or IOT). It fails to boot on the first reboot, from the freshly created partition. It seems to find the partition, but then it only shows Dell logo with rotating dots animation indefinitely.  Some related settings and failed attempts: - doesnt work on both M2 and SATA media  - same disk plugged into an HP desktop PC starts as it should (tries to continue setting up windows) - installing Windows 10 Pro setup on same SATA disk starts as it should (tries to continue setting up windows) - tried all "bootrec" commands: no difference. - updated BIOS to 1.2.1(the most recent) - no difference - BIOS boot option seems to be completely broken. elements are added, removed or changing positions without my consent. The 1st option is Windows boot manager. Tried setting up the option by hand, but that does not change much... Once, after I randomly added to list combination of recovery boot and EFI windows boot, I was able to see the repair screen (probably booted to repair partition) and subsequently, after selecting startup repair and restart it booted! But then I decided to cleanup the messed up settings in BIOS and NEVER was able to see it booting again...  - System came with RAID mode for SATA, but it doesn't see drives for installing in this mode. I set it to AHCI. - tried to install Win10 Pro and then (from it) to launch setup.exe to upgrade to LTSB -> again fails on reboot... Please help. Any hints/ideas are much appreciated. Thanks in advance. Igor.  
Can't install Windows 2016 LTSB on Optiplex 7090