I had removed the main board and display (carefully) and it is obvious that it has be 'worked on' before. After check solder joints and everything else I could think off (no loose parts in the unit) I put it back together (carefully - display connector on correctly) it would sometimes power up sometimes not. Once it ran for 15 minutes, then quit, not light no nothing, and has not powered up since....hence the reference to 'parts machine'.