losing signal to center channel and subwoofer


Hi, I get no sound from either my sub or my center channel after switching between modes. I am using a B&K Reference 30 Pre/Pro. I don't beleive my amp is involved merely for the fact that there's no connection to the amp from the sub. Could the processor be going out?
chucknms
I'm switching between stereo and surround modes. For instance, if I switch from 5-channel stereo to 5-channel surround, I will lose the center and sub. Also, I can switch between various stereo channels and subsequently lose the signal when I go back to 5-channel stereo.

I called B&K and was advised to reset the processor which I did, but that didn't solve the problem. It appears worse now. I haven't been able to get anything from the center or sub all day. Usually I could just switch the system off and regain those channels, but now that doesn't appear to work.
You may have to go into the setup menu and make the sure the selections for the center channel and sub are turn on. Could be as simple as that. If they are, then check the levels for both. They could be turned all the way down.

Keep us posted.

Craig