Mac keeps restarting for no clear reason.

This usually indicates a failing power supply. Over time the frequency of restarts will increase and you will not get a kernel panic with it.

"Sorry, but I think Jon Price nailed it in a previous comment. Apple engineered an expiration date into the mid-2011 Mac Mini, triggered by their latest 'free' OS upgrades. There have been far too many people chasing the same issue, trying the same solutions, ending up with the same result.

Apple hardware over five years old (cpu's or phones) cannot be trusted.

After 25+ years of being an Apple fanboy, I'm over them. Now a committed Windoze user (hate the software, but the hardware is solid)."

"I have a Mac Pro tower mid 2011, Xeon two quad cores. After installing Mac Mojave my computer kept restarting then not starting. I tried everything from replacing CR 2032 battery, to changing my graphics card, to pushing all sorts of button combinations, testing my Power supply - it was working fine, to taking out the CR2032 and letting the computer sit without power for 48 hours( which has worked for me before on earlier towers and MacBookPro, lately.

As a last resort I put in a Windows 10 hard drive( having seen a couple of Mac Book Pros using Windows 10) and I am happy to report my Mac is working perfectly.

I had some problems after installing High Sierra a few months ago and I believe that Apple is inadvertently damaging computers which it says are compatible to it’s new systems but is not. I doubt very much that Apple is going through the process of dragging out older Macs and testing their newer systems on them one at a time. I suspect that that they merely applying a formula with regard to basic common elements( like does the computer use DDR3, is it an Intel chip based machine, can it support adequate graphics and so on.) I also think that they have upgraded my firmware incorrectly.

I dislike Windows generally but I spent 800$ for this machine - Windows isn’t that hard to use!"

Unfortunately, replacing power supply did not help. The shutdowns kept getting more and more frequent. Since there is no new Mac Mini's from apple, I am experimenting with a hackintosh, based on an Intel NUC.

Did anyone ever come up with a solution for this? My 2012 Mini has the same problem. It was my media server, so now I've replaced it with a Windows 10 PC. The mini is now in my workshop. A faulty power supply does seem like a plausible culprit for the random rebooting. I am toying with the idea of removing the existing power supply and powering it with an external 12 VDC power supply. Any thoughts? Am I wasting my time?

Mine does this too. Just shuts down likes it a scheduled power saving thing or something. If I’m using the computer it’s fine. If it’s left alone, it tries to shut down after 20 minutes. Was hoping to use this as a media server but it’s useless. Very frustrating as I’ve adjusted every setting I know to address.