Guys, I hooked up my new AVR-1804 today and it will only play a cd or the radio for maybe a second before it turns itself off and then the standby light flashes. It did this when I tried the tone test as well. Is my receiver a dud? What could I be doing wrong with it. Please help me out. I am using the jbl northridge speakers all around and have a jbl 10 inch sub.