I have a 2011 Mac Mini (MC816LL/A ) with a graphic card. About two years ago, the display failed and I had to get it repaired and the technician told me it was due to graphic card problem. Same problem happened last year and the diagnosis was the same. I used to observed that the mac would get heated and the fan used to work most of the time because I could make out because of the fan noise. Last week again the display would not come nor could I hear the sound of the "Happy Mac" when switching on the Mac Mini. I have 16 GB of Ram and two hard disks - one 128 GB SSD and one 1 TB Hard Disk. I would be grateful if someone can identify the source of this problem and the steps I should to take to prevent its recurrence.