Stops Functioning During a simple stitch the machine started to make loud noises as if a belt (on a car) were loose then stopped working completely. The electrical plug was fine, the thread and bobbin fine. Any clues where to begin (continue) the search?

I assume you are using the foot control not the Stop/Start button?

Simple straight stitch or a programmed pattern?

Could be foot pedal issue, so try using Stop/Start and a simple straight stitch. Or could be a programming error or other so I suggest you isolate any foot pedal issue by using Stop/Start and simple straight stitch. Reply here with results.

There is a spring that got loose from the needle arm that keeps pressure on the arm. It needs to be reattached. Anyway, make sure all of the normal adjustments are set properly. Just one adjustment wrong will cause the machine to only run in a straight stitch. Possibly a button hole or something else. Remove the top of the machine and look down where the needle arm is. The needle arm bracket has got to pull the arm towards the arm using the pressure of an attached spring. This spring is hanging inside the machine from a permanent side bracket. If it isn't there then it has dropped to the bottom of the machine. Anyway, the needle arm must have the sideward pull in order for the machine to produce a zigzag stitch.

Sounds like you've got a thread jam going on in the bobbin case area. Good cleaning and a new needle will probably fix it. See: https://answers.yahoo.com/question/index?qid=20091202121550AAHxN8y

Needle breaks
1.the needle is damaged
2.the needle is not correctly inserted
3.wrong size needle for the fabric
4.the wrong foot is attached
5.the needle clamp screw is loose
6. Top tension is too tight
7. Machine could be out of time--needs to be checked at a repair
shop

it's very possible that when the needle broke the machine went out of time & would have to be retimed at a sewing machine shop

call Singer at 1-800-4singer and ask them to walk you through some tests. They can advise you if it is under warranty.

hi! there,
open needle plate if the shuttle race and the bobbins has been pull out that making noise,or accumulation of thread under bobbins, if nothing there, run machine and check if shuttle race and bobbins are moving,also with the needle if not,there are opening at the bottom of machine try to open if some gears are broken,or belt is slip.
if broken gears there a lot of parts before you can pull out gear, beside the timing order you cannot put back.this should be done by technician expert
in sewing machine.take this to service center.
cheers have a nice day just rate me.

this sounds like its set for zippers check settings!

ok,,when you press the foot peddle you will hear a continuous noise like a motor running that means its not the foot peddle, if not peddle is dying or motor carbon brushes are worn, this is a simple fix, we just need to narrow it down

sews only one stitch at a time and have to wait a few seconds before it will do this