Nothing it is brand new, only sewed on it for a few days.
Change the needle. change the foot. change the stich setting. maybe you have the stich set to zig-zag or other? set stich for shortest, smallest length and flip-over the bobbin. Sounds like noise made when bobbin isn't seated properly or foot doesn't match stich choice.
If the sewing machine is brand new, then take it back and get another one
SOURCE: Brother Sewing Machine model:CS8150 bobbin thread problems
The top of the machine is not threaded correctly. First raise the presserfot then rethread the machine. Bottom looping is usually caused by a lack of top tension. There could allso be a bur on the hook.
SOURCE: I need the manual to Euro=Pro, Model 7500, Craft N' Sew Please..
http://homeappliance.manualsonline.com/ex/thread/view/idThread/159782
This one is in 3 languages, but it is worth the read. The diagram to choose the patterns from the frony of the machine are on page 28. Hope this helps.
SOURCE: Bernina Aurora 450 Sewing Machine
If the buzzing noise is coming from the motor it may be the suppressor on the way out and unfortunately for a Bernina it will be a shop job, if the buzzing is coming from the foot control then you can undo the foot control and take out the suppressor and discard it.
SOURCE: should I oil my Elna 3005 sewing machine?
Many of the new models do not require oiling.
Check the maintenace section of the manual for cleaning the shuttle area. Sometimes lint can build up and cause the machine to get noisy.
If it has been over a year since the machine was serviced, it may be time for a proffesional tune-up.
SOURCE: do i need to oil my baby lock sewing machine?? Quiter's choice.
I cannot find a manual for this machine except at sew4less.com and the price is $14.95.
Contact Babylock to see if they will provide you with a download of the manual - http://www.babylock.com/contact-us/index.asp
If this is a mechanical machine, use sewing machine oil and the shuttle may be the only place it will need to be oil.
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