My imac 21.5" 2010 model heats up in the top left corner (backside) when iphoto is on ad trying to generate thumbnails? Can anyone help as to why this is. It has been serviced and passed all heating tests? Thanks in advance

I just had my iMac sent away for repair as it kept heating up to the point where you could not touch the top left corner of the machine. It really only heats up when i open iPhoto and it is generating thumbnails for all the events. (Some reason it has lost all the thumbnails).
The Mac came back yesterday and they replaced the fans and cleaned out the machine and it has passed all heating tests.

As user Seventy one recommended above, the "iStatPro" Free software is very useful in determining just how hot your internal hardware components are getting.  You could post some of the temp readings from it here so we can comment on them.  
                                    http://www.macupdate.com/app/mac/20364/istat-pro

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