assuming your motor has a solinoid you said there was no sound when you turn the key most of the time you should be able to hear the solinoid click when the key is turned to the start position if there is no click noise at the solinoid get a test light and make sure you are getting 12volts to the primary side of the solinoid and when you turn the key to the start position there should be 12 volts applied to the start terminal on the solinoid the other is usually ground if there is 12volts on the start terminal and on the primary terminal and the solinoid does not engage the starter then replace the solinoid if the solinoid does engage and send 12 volts to the starter and it does not engage the it is more than likely bad as long as you have a good ground to double check the starter you can take a ohm meter and read across the positive terminal and the frame of the starter it should read continuity if it reads open then the starter is bad. Good luck hope i didn't confuse you.