The fabric doesn’t move when i sew

Hi hi back again, ive just changed a needle after the last one got bent and stuck so i took it out and replaced it with a new one, for some reason the fabric doesn’t move when i try stitching with it, it did one test stitch but after it didn’t move when i try to sew, the fabric dogs or the thing that moves with the fabric still goes up and down but doesn’t really move the fabric