I installed a Samsung 250 GB m.2 SDD.  I used Macrium software to clone HDD (because I was unable to download Samsung Migration software or the Samsung driver, apparently because of some of my settings).  Computer worked fine after installation and cloning, except I wanted to set it to boot from SSD.  In BIOS software I was unable to select SSD as #1 boot, as my choices were Boot Manager, IPV4 and IPV6.  I read that changing the BIOS settings from secure boot enabled to disabled, and Load Legacy … would enable me to see the SSD as one of the possible boot drives.  So, I disabled secure boot, using the BIOS software that comes up after pressing F2 on startup.  

Then computer refused to boot and only gave a black screen.  I have tried all three options in the Boot Rescue software (ESC+Ctrl on start) several times.  It re-writes the boot file, seemingly correctly, then still just get a black screen upon startup.  I have taken the battery out and waited 6 minutes.  That didn't help either.  I have used a second computer to create an XPS 8910 BIOS file, but computer does not seem to recognize it when I start with it inserted.  Just get a black screen.  Also, Ctrl+ESC does not seem to work when the USB is inserted.  

I made no other changes to the BIOS--just disabled secure boot.