Check you bobbin casing. These are often parts that fail sooner or later and can be used in other models. Save all your tools and spool ends. The threader parts are also pieces that fail frequently and can be used from one model to another. If your machine travels with you like some of mine do another thing that breaks from time to time is the thread holders. They are plastic and break easily. I have had to replace 3 one on my Pfaff. Light bulbs too. When quilting with our machines some parts will wear out much quicker than others. One other thing. The motherboard is not difficult to install. If it is still available, you may want to ask a computer geek to put it in for you. It should reset the entire machine for you if it is the motherboard. I have replace a couple in older machines with little to no difficulty.