Make sure the breaker isn't tripped. If the breaker is tripped, you should call an electrician to test the motor. The only other servicable part is the inlet screen.
You should listen to the pump to see if its at all even still active. alot of times pump start to malfuntion even though the are made to be under wet conditions. then you should check to see if the hose is receiving clean drainage. A blocked hose could malfuntion your pump by overflow.
A good plumbing contractor is the best place to start. There are two different types of well pumps. Jet pumps which go under a house and submersible pumps which go down in the well. The plumbing contractor should be made aware of which you have.