My Yamaha receiver RX - V730 won't power on. I hear a double click when I hit the power button. Seems like it's turning itself off immediately and in a safety mode of some sort. Any advice before I chalk it up as a loss? The receiver is 16 years old...just want to make sure it's shot before I toss it. I also unplugged all wiring from the back to assure it wasn't a speaker wire issue.