So you unplugged the motor from the MOTHERBOARD? I took electronics in 9th grade, so consider that before you take my advice. It's a DC motor, so I am assuming that the 0 to 7 switch is a "dimmer" . If the speed switch is working it should show variable resistance, I would think. If the motor is unplugged it shouldn't be the motor. Some how you need to get 24V (or less) DC to the motor without anything else in the way to see if it turns. My first thought was 16 AA cells lined end to end, but only I'm that crazy. You can do anything as long as you keep line voltage OUT of the picture. I wouldn't be surprised if a 9V transistor battery wouldn't move the motor slightly under no load.
That speed switch should dim a test light, and should show a change in Ohms as you turn it. If it's shorted, i.e. conducting electric current without any effect that could be your problem.
Remember my training consisted of building a tachometer for my '65 Chevy Biscayne with a 230 cu in 6 cylinder.
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