What type of steps do you have. For SCS and Kwikee power to the motor is suspect. Control board turns the power on and off, reverses the power for in out, to the motor. If motor is powered and steps aren't moving, trying tapping the step/linkage with a hammer, maybe they are jammed. If not motor could be burned out.
If you have your step operators manual it should have some basic troubleshooting steps to help you figure out what the problem is.
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2008 Newmar VTDP - 3330 - ISBXT 350 Spartan NVS
Toad - 2013 Mini Cooper S or 93 Nissan 4WD PU
FMCA F113720, NKK 18573