Late yesterday we decided to go with a suggestion we received on the Spiceworks forum.  We pulled the four drives out about three inches and started up the server hitting F2 to get into the setup.  From there Device Management and on to the controller where we did the reset, clearing all settings back to factory.  We then went into the Ctrl-R RAID Setup and verified there were no drives.  Then we powered down, plugged the drives back in and the server started, showing the four drives and one virtual device.  Windows booted up and we are back in business.
We have a PE R420, 4 300Gb Drives using RAID5.  OS is Server 2016 Std. The small controller module on this production server failed and we got a very similar one to replace it, a Perc H310 Mini.  We plugged the controller in and after a short time the following message came up. Foreign configuration(s) found on adapterPress any key to continue or 'C' load configuration utility,or 'F' to import the foreign configuration(s) and continue. I had done some reading about migrating drives to an identical server, another option we considered, and it saying the configuration is stored on both the drives and the controller and you'd likely have to import the configuration stored off the drives into the controller on the new server when prompted.  So without really thinking through the wording on the above message, I hit "F". Then I get the message  All of the disks from your previous configuration are gone. If this is an unexpected message, then please power off your system and check your cablesto ensure all disks are present. Press any key to continue, or 'C' to load the configuration utility. So I powered down rather than making a choice that would result in loss of our data.  To make things worse our Windows Server Backup external disks can't be seen or used to restore onto a Hyper-V VM or another spare server using a Server 2016 ISO or DVD.   Thanks for any suggestions!  
Server Controller issue - All of the disks from your previous configuration are 
gone.