Hello CalypsoArt Welcome to the Seven Forums!
The basic wipe of the first WD Green Power model drive saw the boot files wiped as well as the first 7 install seen there having been the first drive on the system even with the second new install onto the SSD you added in.
Most likely you will need to perform another clean install to see the best results by first unplugging the WD GP drive to avoid the placement of the boot files there a second time. Once the drive was wiped the existing BCD store unless seeing the separate 100mb system reseverved partition was wiped as well leaving you with no option for rebuilding the orginal.
Just missed hearing the good news! Glad to hear that worked out for you!