I have the most recent base model Mac Mini that I've been lovingly using as a HTPC. I run everything through it using a HDhomerun setup. I've never had an issue then I updated to El Capitan. Now I'm having an issue that has rendered it completely useless and I'm not sure if it's the software or not. I have the Mini connected to my Yamaha receiver via HDMI then the receiver goes to the TV. My screen is solid pink and there is nothing I can do about it. I've reset and unplugged it several times, let it sit all last night unplugged, and when I go to boot it up I can see the apple logo behind a pink haze then it goes completely pink again. I can hear the keyboard from the login screen making noises but can't see anything. My TV is a 1080p TV is it possible the mini has some issue with the resolution? I have an Xbox one as well that is connected to the receiver and it's crystal clear. I swapped HDMI cables with the xbox and still the Pink Screen. Can anyone give me any ideas? I don't have an external monitor but really want this issue to get fixed. It worked well for months then all the sudden I updated and BOOM. Anyway to completely reset it back to the original software?