I wanted to share an issue I had with my iMac, and how one of your support articles helped me to recover. I always properly shut down my iMac (27–inch, late 2014) from the Apple icon shutdown menu at the end of the day.
A couple of days ago when I powered it on the screen would appear to turn on, but freeze half way through the process. I tried to shut down and restart, with no success. I then remembered that your magazine has an “Essential Support Article” section, and I tried the safe mode and recovery function.