I have a 510 Elite that has been doing the loud pop and then quitting for sometime. It comes back on after a while but recently it sometimes does not even come on. I have read a lot of the threads on this and it seems it could be solder joints like Mr. Bob says. Don't know if it solder joints in the Power supply or other connectors. I am not a pro solder guy though I have done some solder joints in the past.
I will take a look at the connectors in the back. I have a guy coming out but would like to find a guy like Mr. Bob in LA or send it to you.