Just a shot in the dark......Unplug the machine. Not from the wall but from the back of the machine. Now replug. just in case it's a connection issue. I can't remember if the Juki has a needle up and down button or not. If it does. push this also and have it do it's full function, needle down- needle up. Just in case....check your needle position. Is it all the way up in the shaft? One last pointer for all of you that have this machine. The Singer 2045 needles size 14 is good, work awesome in the Juki. The scarf of the needle is a little deeper therefore making a better stitch. Hope this helps.