My Raspberry Pi is now back on the Network (see: my Rpi posts).
It has been offline, because I did not have an HDMI Display, and was not able to see the boot error messages. And, therefore I was not able to correct the boot problem.
I now have an HDMI Display, and have fixed the boot problem. The Rpi needed a simple "manual file system check" (i.e., fsck -y /dev/<disk>).
Currently my Rpi is back on the Network as before at: http://rpi.wa0uwh.com:8040/
The Rpi maybe on-or-offline the next few weeks as I try different system configurations.