It took me a while to track this down, so I thought I'd explain why the macmini5,2 MC816LL/A mid-level mid-2011 mini burns out. I would appreciate anyone who can refine or correct the story. All the apple mac minis and mac books (and probably other apple products) have heat sinks installed with low-quality thermal paste. I guess in china they figure why not save a few cents and apple does not care. As the units age the paste dries out so the heat sink is progressively less effective and the computer chips get hotter than they should. Temperature sensors turn the machine off before it burns up. This means, as your mac gets older you can expect it to turn off for no obvious reason because it is actually overheating. Besides the thermal paste in all macs, there is a special problem with the Radeon graphics chips in 2011 mac minis and in some of the mac books from 2011. The Radeon chips are connected to the logic board with defective wires that break upon frequent overheating. Among cognoscenti this defect is called "Radeongate". The combination of the cheap paste and the bad wires means 2011 models with Radeon chips eventually burn out. Some mac book owners sued Apple which then issued an extended warranty to repair the mac books but not the mac mini. Owners of macmini5,2 MC816LL/A are, as they say, screwed. If you try to discuss any of this with a genius bar tech he (it is always a he) will vehemently deny all of it but at the same time he will know an awful lot about the lawsuit and that it was not successful, even though the extended mac book warranty is there for everyone to see. I guess this is called denying liability. You have no idea how infuriating it is to be lied to by a company that you have grown up with and always trusted to do the right thing. I guess Jobs and Wozniack were just in it for the money no matter what all the books and movies say about changing the world.