I'm running a Mac Mini with El Capitan. It has one job - Plex. Glorious glorious Plex!
Every now and then I experience issues - Plex locks up, no audio, whatever. It doesn't matter. So I walk over to the TV, press the power button on the Mac Mini and it shuts down. Then I press it again, and it starts.
I have an SSD in the Mac Mini so it boots as fast as possible. I need to get back to my media!
So what's my problem? That stupid OSX nag screen that sits there for 60 seconds because it thinks there was a problem.
It's this one:

I've Googled too much and not come up with a resolution. Anyone have any suggestions?