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Are you saying that you changed the needle? You cannot tell if your needle has a burr on it or not. Because if you did, you may have messed up your timing and need service because it will take special tools and know how to fix it. . Try another needle one more time (make sure that the flat side faces away from you) and different thread. Rethread with your presser foot up, then pull the top thread, it should move smoothly, now lower the presser foot and pull the thread, it should barely move. This should seat the thread in the tension discs. Also, check that you aren't using the wrong size needle for the task at hand.
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