So I've had my 2011 Mac Mini with 16gb ram for about a year and a half now and it has had a weird issue its whole life where it will just randomly "click" and then restart with no cause about once or twice a week. However, in the past month the restarting has gotten more frequent. It could be because I've recently been doing a lot of iMovie/iDVD work but I'm not sure if thats the case. I ran memtest to see if it was the aftermarket ram but it passed everything fine. I thought it could be the HDD but I've already had the HDD replaced once by Apple about 5 months after I bought the computer and I feel like it's not likely for two HDD's to fail. Anyone have any idea whats going on? Any help is immensely appreciated! P.S. The problem seems a lot more likely when Skype is running but it still crashes when Skype isn't open.