I have an RC64R remote that I use with my HR24-500 DirecTV receiver. The power button on the remote is starting to fail so I purchased an RC66RX remote as a replacement. The problem is I can't get the receiver and the new remote to communicate. I can get the remote to turn the TV on/off but I can't get it to turn on the receiver. Any suggestions on how I can get the receiver to recognize the new remote? Thanks.