1987 Buick Century Starter problem

someone tried to give me a jump, but I didnt realize that my altenator was frozen solid preventing the car from cranking at all. After a few tries the starter just quit and now you get nothing when you turn the key to the start position. I have replaced the altenator and the silinoid on the starter. But still nothing ! What else could I have damaged ? all the lights come on like normal when you turn the key on, you just get nothing when you try to start it.