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If you have replaced all of that then in this case the compressor is likely just locked up. Sometimes you can use a hard start relay for such cases that can buy more time out of stuck compressors. It works on some, but not all cases. Here is a link to one at Amazon.com.
No. One is a start winding and the other is a main winding. The start winding needs to be timed properly to start the compressor by switching automatically to the main winding when the start winding has been energized for a specific period of time.