Problem found. I had to call in a service technician who found that a relay on my spindle drive board was not functioning correctly. He could do one of two things for me: 1) Order me a new relay and take out the old relay and re-solder the new relay in place or 2) Get me running right away by soldering a "jumper" wire in place. I took option 2 to get running ASAP, but have plans to get the relay replaced in the near future. With the relay not functioning correctly, the spindle would get up to speed, but the relay would not tell the machine that it had reached the desired RPM and would not "check out."