power problem

First I'll address the elephant in the room. Yes I am new to this forum and yes I did a google search (many searches) to try to find a answer yet I have not found anyone's circumstance as close to mine. TL'DR My Vizio is fried. What is fried I'm not sure. I suspect main board or power board or...

So i have these Fisher ST-515 and believe me, the bass is orgasmic when its connected through a amplifier. But when its connected to a A/V receiver the bass is not really that noticeable. is there something i can do? A/V Receiver: Yamaha RX-675

I have had the receiver for a few years and never hooked it up. I had a friend over hooking up speaker wire to the unit. When I went to turn the unit on the next day....it powers on for two seconds and then turns itself off. Has any one else had that issue or knows how to fix it??