Humming unit that won't move
The unit can hum and do nothing, which points to a capacitor or a worn belt. Or the whole thing goes dead, which is often the circuit board or the wall switch wiring, not the motor at all. On homes built between 1947 and 1987 - the bulk of the housing stock across this service area, with a median build year around 1964 - we also see openers that were swapped in decades after the house itself, bolted to original wood headers that have since dried and shifted.