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Best advice would be to consult your owner's manual. The most common serger problems are caused by incorrect threading or not threading the threads in the proper order. With most sergers, the upper looper should be threaded first. The lower looper is threaded second and the lower looper thread tail should drape OVER the upper looper. Then thread the needles.
Be sure when threading that each thread is pulled snugly into the tension disks.
If you have not already done so, try changing your needles. Sometimes the needles will be slightly bent or dull and cause thread breaks. If this does not help check your tensions. These should be set somewhere between 4 and 6 generally. If one is far out of this range, try resetting it. If you try both these things and still have trouble, it is likely that your machine is out of time. In this situation it would be best to take your machine to a reputable sewing machine repair shop for repair. Retiming a serger can be very difficult for a novice, and can be quite and unpleasant and tedious job, best left to a professional who is well versed in serger repair.
I would suggest that you check the needles again, make sure they are both fully up into the needle housing. Also they should be at different heights in order to form the stitch sequence.
It is important that you thread the loopers first in the sequence shown in your manual, then the needles. So you may need to recheck the threading again and make sure the threads are in all the eyes correctly, especially the lower looper. Also some overlockers, have a sliding eye on the lower looper for ease of threading, if yours does, make sure it has been slid back to normal operating position.
When you have checked the threading up, take all four threads under the raised pressure foot and make sure that the upper looper thread and lower looper threads are not crossing over each other. Lower the pressure foot and try to chain off again. I hope this helps you to resolve the issue.