Starter. What you are hearing is likely the bendix engaging, but the starter isn't turning. I see that a lot. Make sure you are getting ignition power at the s terminal and 12 volts at the power terminal. If you have those, you have a bad starter.
I'm sorry, but I'm not familiar with what each terminal is called. Is the power terminal the big one with a wire coming from the battery and another wire going to the large stud on the starter? And is the s terminal the one that goes to the smaller stud on the starter?
When you say ignition power, I would need to be able to read the voltage when I try to start the car, not just having the key in the run position? I don't have any help, so if that's the case, its going to be difficult to do by myself.