It sounds like you need to rethread and adjust the tension on the top thread.

beverly

I have a singer quantum futura, I am wondering if you had the presser foot lifter in the up position if not the thread does not engage right. my machine is very simple to thread, guessing yours is also, make sure you have follow each arrow also the bobbin needs to be placed in a certain way so that the thread is fed out right, do you have your book ? hope this helps you Rene

yea i have my book and i did everything it said. re-threaded the bobbin. replaced the needle. ect. its weird because i was sewing with it last week and it did perfect, now its all loose.

What model did you buy? Someone with your model will be able to help you.

Also, you can't always rely on presets.

My machine (Kenmore) did bottom loop tension, bump and grind, gonna eat your fabric thing yesterday. I pulled the throat plate off and bobbin case out...there was a tiny piece of thread from 2 projects ago gumming up the works under the bobbin case. I clean my machine daily with a bag close by for thread cuttings so this was a rare happening.

Pull the throat plate and bobbin case and clean under everything.

Do you have little ones? One of mine (the cute lil' rascal!)was fascinated with my tension dial when he was little & I soon memorized the correct number & learned to check it each time before I began to sew!
Suzi

What about the needle? Try changing it to a new one, that might be the problem. Needles get blunt quickly, they really only have 8 hours sewing life in them and should be changed. I was taught that you should start with a new needle for each garment, I don't always do that but if I am sewing something special I do.