Went through the format menu and and executed every option under it. One of them must have been factory reset, and that seems to have done the trick. I actually see my SD card's contents now. Why that worked, I have no idea, but I won't complain. You all saved the day and my wallet. Thanks, to all of you.Factory reset Walkman and update if necessary.
Insert SD CARD and format in Walkman.
Connect Walkman and transfer files to music folder.
If sd card not detected, either the card is kaput or Walkman hardware fail.
Now to figure out the rest of these menus...