Both of my A600's died last year

One of them was one of the first to be made - the motherboard was labelled A300 (the A600's original name which was changed at the very last minute).
One went with a loud click and then I smelt burning so quickly switched it off. The 2nd one was unusually hot around the top left corner (power supply area) and then died one day when I switched her on.
Not opened either up since - due to lack if time.
Regards,
Lonewolf10