While AC is on, the condenser motor was cycling on and off in 10 second intervals. Tried shutting off the AC (both power and thermostat) and then restarting, had the same results. I tried this a few times and now the condenser motor doesn't come on at all. The AC unit outside runs and the blower motor on the furnace runs but the condenser fan does not. Any ideas of what I can check?

Most likely you are going to need a new motor. You can try replacing the capacitor (cheap & easy) but I suspect a new motor is going to be the cure.