...If everything already mentioned doesn't help (all good suggestions), and you hear nothing from the steps, no indication it is 'trying' to come out....You may well have a bad, burnt out motor.
One way to tell: Crawl underneath the steps, RV, and disconnect the connector, wires going to the motor that moves the steps. If you have a voltmeter that measures continuity, hook it across the two leads going to the motor, see if it beeps or whatever it does, when there is continuity, a 'closed' circuit with little resistance. If you get the beep indicating continuity between the two motor leads/wires, then the motor is shot. Time to order and put in a new motor.
I just went through exactly this with our steps a few months ago. Unit was just 4 years old, entry steps quit working. Was suspicious it was the motor from the get-go, so first thing I did was continuity test to see if motor was shorted out internally, and it was. Fortunately, as I recall the new motor only costed just under $100, and I was able to put it in myself. Same thing happened with the motor on our electric awning a few months before, and I was able to replace that one myself, too.
I'm starting to see a pattern with our MH - Right at 4 years old, seems electric motors that are outside, exposed to the elements, are starting to go. First the awning, then the steps. Only other motor outside I can think of (but am afraid to), is the one for the hydraulic jacks. Sure hope it ain't gonna be next, haha.