I have a HR-21 receiver hooked up to my 58" Panasonic TV using a HDMI cable. I have a second TV hooked up to the same HR-21 using a RG6 cable. On the second TV, I'm getting the message, your TV or it's cables are not HD. On the remote control, press and hold down the Exit key until you see a confirmation that your receiver has been set for standard definition. Is there any way to keep that message from appearing on the 2nd TV without having to change from 1080 to 480 ?