I have an Onkyo 702b AVR that I was going to use for a whole house audio amp. It has sat in the closet for about 1 - 1.5 years. when I pulled it out and tested it to make sure that it works OK. I put on the radio and just put it up to a random speaker and I only get a buzzing when I turn up the volume. Is there a way that an amp can become non working by just sitting. Does anyonne know where once can find the factory reset procedure so that I could reset the amp to factory and see if it still works. Or, if you know of another method on how to test this, I would appreciate it.