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Try installing a brand new needle. A bent needle sometimes will not connect properly. Be sure that both upper and bobbin threads are threaded correctly.
On the other hand, the needle/hook could be out of time. You can check that by hand turning the handwheel and watching the needle/hook movement. There are a multitude of web sites and videos that discuss timing. Or--check with a sewing machine technician.
try these suggestions change the needle
Correct needle insertion is mandatory for proper use of your sewing machine.
Raise the needle bar to the highest point, then loosen the needle clamp screw to remove the old needle.
Place the new needle in the needle clamp with the flat side of the needle facing the back, (round needle, the groove in the needle should face away from the shaft).
Push the needle all the way up as far as it will go. Then tighten the needle clamp screw.
try rethreading the machine top & bobbin make sure the bobbin is not warped make sure the bobbin is wound correctly & inserted correctly in the bobbin case if none of these suggestions help,, then you might think about having the machine checked to see if there is something wrong inside the machine
Upper thread breaks
needle may be in backwards
Raise the needle bar to the highest point, then loosen the clamp screw to remove the old needle, place the new needle in the clamp with the flat side to the back of the machine
Push the needle all the way up to the stop or as far as it will go, then tighten the needle clamp screw
upper tension may be to tight
the needle may be bent or damaged
thread may be hanging up in bobbin case--check area for loose threads or lint