I'm having a similar problem to ones I've seen in the forum here.....I just got a new car with Homelink (one of those built-in transmitters that learns your garage code) and when i was trying to program that, something else got screwed up. The keypad works fine, but neither of my handheld transmitters work, nor does the car one. I get the same result when I hit any of them....the little green light on the GDO blinks rapidly.

I tried reprogramming the handhelds using the instructions on the GDO, which are the same as those above.....I hold down the transmitter button, and then hold down the red button on the GDO until the green light on the GDO blinks rapidly. The only effect this seems to have is after I do it, I have to reprogram my keypad!

Any ideas? I ordered a manual, but it'll be over a week b/c of the holiday before it gets here, and I doubt it'll help anyway.