My singer athena 2000 won't

Question

my singer athena 2000 won't pull the bottom thread up to form a stitch. I know this is an OLD machine and I couldn't find the right selection from the listMy Singer Athena 2000 sewing machine was working fine until today. Everything is working fine except it will not pick up the bobbin thread or wind a bobbin. I dusted the bobbin case, changed needles, bobbins and thread several times but to no avail. Please help!