Need help Onkyo TX-SR702 Problem

[t3h]

Here's my problem, I shut off my receiver last night and everything was working fine. Today I go to turn it on and I am getting no sound out of my 5.1 setup, but I can get sound out of my remote speakers. I have checked all my connections, but they all look good and this setup has been working fine for a little over a year and a half so I don't thing it's anything in the way I have it set up. I have checked all my sources (some analog, some digital) and I don't get anything out of any of them, but the video switching works fine. Is there an overload circuit that I can try resetting? Any suggestions before I take it to an Onkyo service center would be greatly appreciated. Thanks.