I don't know how you rethread after the thread breaks but my wife has had 3 or 4 sergers and has found that if a thread breaks you MUST unthread and start at the beginning and not just try to rethread the one that has broken or you will have trouble.
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First take all the thread out of the machine. Put in new needles and run the machine slowly by hand and see if there is a problem with timing. If the needle hits and bends or breaks... take it in to be timed. If the needle don't hit....
Make sure you are properly threading this thing. Unlike a sewing machine which gives you some leeway, Sergers must be threaded in a certain order. Typically, upper looper, lower looper, right needle left needle. If you break a thread you can't just rethread that thread... you have to start from the beginning.
You might check singerco.com for the manual for this thing. They have most of white's manuals online they are identified by a W before the serger model number.
Make sure that the needle is all the way up in the needle bar. Unscrew until just loose, use finger nail or small screw driver to push up on the needle. The two needles do not line up.The right needle extends longer. Also, make sure that there are no burs on the needles and that they are straight and correct for your machine.