Lets try it in bind mode.
Power the Rx on, let the blinking start. (enter bind mode)
Press and hold the bind button on the back of the Tx, while turning it on. (enter bind mode)
If you get a bind, turn the Rx off. (exit bind mode)
Then turn the Tx off. (exit bind mode)
After you get it bound, ALWAYS turn on Tx first, then turn on the Rx. (This keeps Rx from entering bind mode)