Thanks for your patience Gary,
If your would, I need you to check to see if two key FileVault files on available on your main hard drive for me.
Here's what you do:
• Click anywhere on the blank window of your desktop
• If you look at the Apple menu icon on the upper left corner of your screen
to the right of this icon you should now see Finder and its menu bar.
• Now from the Finder menu bar, click Go >Go to Folder
This popup window should appear
•Type in /Library/Keychains
•Now click the Go
This will take you to a new Finder window within the System Keychains folder.
What you will need to look for are these 2 FileVault Master files.
Let me know if you see them.
I am will be waiting for your feedback on this info. Thanks!