Finally found the reset in the Cntrl R menu. Carefully rebuilt virtual drives. Boot drive defaulted to first VD entered. All disks displayedMS Server 2016 Essentials booted normally! QED (Solution demonstrated)  
Dell T710, Perc H700 back plane, MS Server 2016 Essentials Novice home user NOT A Professional MS Server 2016 Essentials up and running OKInserted 6 Tb drive, added raid 0 for that drive.DISK MANAGEMENT unable to complete a format. Removed disk. Inserted on another computer.Same format failure. Utilized DISK PART, made drive GPT.Formatted normally on this other computer. Replaced Drive in T710 with H700 controller. Controller on boot now says "there are offline or missing virtual drives with preserved cache, etc"Hit any key, brings you to H700 Controller Menu. The "list of Drives" includes the newly formatted 6 Tb drive.It does not NUMBER that disk, hence, it will not let me assign a Raid 0 to that drive.I am also unable to boot into Server 2016. I need to either assign a number to that drive or dump the assignments and start over. Request simple instructions.Thank you  Specifically Virtual Disk Creation Failed. Will not inititialize either.
H700 not numbering disk