if it's the same breaker all the time & it will not reset by switching it off then back on either it's overloaded or a dead short in the wiring. Shorting wiring is hard to finding where the short is located as that could be almost anywhere in that circuit wiring. Overloaded circuits just have too much load on that circuit. After a circuit breaker has been tripped many times I've just replaced the breaker as it will trip out at a lower setting.