Check the power to the motor first or see if the breaker has tripped. If there is power, then check the capacitor. Usually if the capacitor is bad, it will make a humming sound for a few seconds then shut off. If there is no sound, check that the wires in the motor are still connected properly and didn’t come loose.. If still no response, it’s probably time for a new motor – I’d recommend an Intelliflow Variable Speed Pump which will usually pay for itself in 12-18 months by saving you on utility bills each month