I've been having this reoccurring issue where I can turn on the HR21 with the remote, but once on, the HR21 does not respond to the remote. The remote is in IR mode, and I know it's sending because the TV shows it's receiving a signal. It's happened several times, with a RBR being the only thing that worked. Well last night I switched the remote back to RF mode, and with the first power-up for today, it worked... I mention this in case anyone else is having similar problems, this may be a solution.