When you have the new needle in, how is the tension when you pull on the thread? Could it not be threaded right? I haven't had needles break like what you have, but so many little things can happen and you not notice it. I would try completely re-threading it. We had issues with our machine when we first got it and had to re-time the machine a few times to get it just right. I hope you can get it figured out. Do they have a number you can call for help?