I am hoping this isn't as serious as it seems right now. I have been using just the front and center speakers on my receiver and I just hooked up the surround speakers. When I went to power the receiver back on, it won't stay powered up. It turns right off. It is a ONKYO 510. The manual says that the amp protection may have been activated and to contact the dealer. I purchased it online and there isn't a dealer in my area. I unplugged the new speakers and checked all the old connections for frays etc. Everything looks good but I have the same problem when I turned it back on. HELP please. THANKS !!