onkyo tx sr703 av receiver 7 1 channel

greetings .....my long-performing-perfectly TX series receiver amp has posed a new problem to me in our theater room that I cannot resolve: only 2 of the 7 channels play when I use All Channel Stereo ......yet, when I "test tone" all 7 channels, they all test tone perfectly so that tells me no...

Title pretty much says it all. I have an Onkyo TX-SR703. It has a mic that I attach to the amp and it measures the response of the room with white noise and then sets the distance and levels for all of the speakers. But, according to Audyssey's website, the system in this AVR is not...