I'm happily playing with my newly bought Denon 2805, but I have a problem - I simply can't change the input source using the remote control! I have to get up and use the select knob on the amp every time I want to change the input source. I dunno if I have pressed something I shouldnt have, but this has been driving me nuts all day! All the other remote functions seem to be fine. Any ideas you 2805 experts?