I noticed that one of the connectors had slipped back a little in its housing. When I pressed it in and increased the voltage to the stepper from 12 to 24 volts, it started working. When I hooked up all three steppers in place in the CNC, the fuse in the power supply blew. I will work on a better power supply which eliminates spikes. Perhaps it was a spike that bricked the last two BeagleBone Blacks. Thanks all for your help.
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