I had a 722 that slowly died, first making loud squealing noises, then refused to live another day and killed itself and won't turn on again. My bet is that the power supply blew out, and simply needs to be replaced. Does that sound right? Is it costly to take to an electronics guy to get fixed? The unit is not under warranty so I'm stuck with this door-stopper unless I sell it on ebay. How much do you think i can get for it on ebay? Any insite and comments on this would help, thx.