Needle Won't Pick Up Bobbin Thread?

I have been working with my machine, a 15 year old Baby Lock BL1556, for months, changed the needle, thread, settings, bobbin, thread, cleaned it, and read all the help sites I could find. I went back through my settings just now and changed the needle position all the way to the left and it picked the thread up, but still will not do it from the center or right position. Any ideas, before I try to sew with it. Could the timing be out on it?

By Gayle L