I recently came into possession of a well used Crown PS-200 amplifier. When I first turned the amplifier on, I just plugged it in to test that it actually would turn on and when I did, the IOC and Signal Lights all lit up and do not go out. There is no signal going to the amp and there are no cables attached to the amp. Only the amp is plugged in for power. I do not know if this is a simple fix or if the amp is effectively dead. Is there anything i can do trouble shoot it or fix it? Also if at all possible I would like to not send it away.