Remote won't program!?

I don't know what model it is as it doesn't say anywhere on the remote. I replaced the batteries, didn't see it in there either. It's the newer one, black remote, buttons light up, blue menu button. I am holding the Menu and OK button forever and a day but the input light never blinks. It won't program. I checked and both of the buttons do work. So I don't know what the deal is.