Sewing machine won't stitch

The standard factory tension setting for most machines is the halfway point between the high and low number. The upper tension is not meant to be static, ie, the tension adjustment will change depending on what is being sewn.

The tension is correct when the upper thread and bobbin thread meet in the middle of the fabric.

...

try changing the needle--make sure the needle is the right one for
the fabric being sewed, and also inserted the right way in the needle
holder and all the way up into the needle holder
try rethreading the machine top and bobbin--make sure every
thread guide is used
make sure the bobbin is turned the right way in the bobbin case
if none of these suggestion help then the machine needs to be
checked to see if there is a problem with the timing.

Did you drop the feed dogs?

Wow. If I understand your attempt at English. Your machine made a noise and now won't sew or pick up the bobbin thread.

First change your needle and make sure it's full inserted and correctly oriented in the needle bar. Do a test stitch on scrap fabric.

If you still have problems.. check the timing. The shuttle hook should just be starting to pass the needle scarf when the needle is at the lowest point of travel.

I hope that helps you. Good luck.

the motherboard on the machine could have something wrong with it

is it possible that the needles are in backwards?
it's very possible that the machine is out of time & would have to be taken to a sewing machine repair shop to be retimed

sounds like something got damaged or broke & the machine needs to be checked

put in a new needle
rethread the machine top & bobbin--use every thread guide
make sure the zig zag settings are correct
it's also possible that the machine could have a worn or damaged gear or cam--which would have to be checked at a sewing machine shop

have you checked the needle to make sure it's in correctly--flat side of needle goes to the back of the machine

correct needle insertion is mandatory for the proper use in 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 (or if using a round needle the groove in the needle should be facing away from the shaft.
push the needle all the way up to the stop, or as far as it will go, then tighten the needle clamp screw.

how to decide which needle is correct to sew with, it depends on the fabric & thread being used for the project.
like for example, I've been sewing for over 30 years, I'm sewing a stretchy fabric & regular needles won't work because they skip stitches & will pull the fabric thus damaging the fabric, the needle I have to use is a singer universal ball point needles, & I have no problem with the stitches they come out fine.

go to sewingmanuals.com....You can buy a download for your machine or a dvd