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look down in there there is a hook to grab the top thread may have gotten bent or loosend , you may also try comparing the new neddle with the old and be sure it is correct, look for a small latch under the grab foot, please rate -jeff
Manually feed the bobbin thread through the needle top plate and try sewing. The result might give you a further clue as to what's going on. If its not something as obvious as excessive tension or incorrect routing of the bobbin thread, it might be the clearance between the needle and the needle hook. Did you try changing needles in case it's a bent needle?
1. The needle is not inserted correctly
Remove needle & reinsert needle( flat side towards the back of machine)
2. The needle is damaged
replace with new needle
3. The wrong size needle is being used
Choose a needle to suit the thread & fabric
4. The foot not attached correctly
Check & attach correctly
if you can send me the model number of the machine,, I'll see if singer has a free downloadable manual
The needle thread breaks
1. the needle thread is not threaded properly
2. The needle thread tension is to tight
3. The needle is bent or blunt
4. The needle is incorrectly inserted
5. The needle thread & the bobbin thread are not set under the presser foot when starting to sew
6. the threads were not drawn to the rear after sewing
7. The thread is either to heavy or to fine for the needle
I assume you checked to see there are no needle bits in the bobbin case holder.
Without looking at the machine it is difficult to diagnose the problem. It could be any one or a combination of problems, timing, needle bar height, damage to the hook and base etc.
I strongly suggest you have it looked at by a sewing machine tech.