I don't know if you received an answer to your question or not, but I had the same problem with my 350QX and couldn't figure it out. As it turns out, you MUST have all your trims set to neutral before it will bind. This is what the fast beeping is. Also, if you are inside, try switching out of GPS mode. I finally set my DX7s trims to neutral and bingo, the quad bound. I hope this helps.