We've just sent out our monthly newsletter to our SewWithSarah.com subscribers, entitled "My Sewing Machine Hates Me!" and we've gotten a load of comments and feedback from that newsletter already indicating that we've hit the nail on the head with good information.  One comment that I've gotten permission to quote here just repeats all that we keep harping on -- check the needles; check the thread, check the bobbins, etc.  Sometimes the simple things that could have been avoided, force us to take the machine to the repair shop.  Read this:  " Make sure you are using the correct bobbin.  I took my machine in for the same problem and was called back as soon as I got home. When I arrived to pick it up and asked how much, my jaw hit the floor when he answered 'two an a quarter.'  Then he explained that's what he charged for the correct bobbin.  Wayne"  Thanks Wayne for writing in!