After having the same problem as Wendy--BSR not working, no red light, no nuthin', and major frustration after a couple of hours---I searched for answers on the internet. FINALLY: there was a picture of my machine with the feed dog button. I looked at my machine and sure enough, I wasn't pushing the button ALL the way in. I thought I was pushing the button correctly because the feed dogs did go down but now know it wasn't all the way in. Relieved!!
(Now wish I could move my fabric around faster before the thing beeps at me. Seems to go kind of slow but I'm not complaining!)