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Released on July 21, 2011. Core i5 or Core i7 Processor. Thunderbolt. This unit is also used to run the Mac mini Server configuration.

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Mac keeps restarting for no clear reason.

My Mini is a stock mini 2.5 Core i5, 16GB RAM, and a Radeon HD 6630M, and has recently begun to restart randomly. Usually this occurs when left idle for ten to twenty minutes. Using it the entire time seems to prevent this issue from occurring. I reformatted and freshly installed Sierra and the issue persists. The RAM was added about six months ago, but the restarts are a good deal more recent that that.

When the computer restarts, it doesn't indicate a kernel panic.

No idea what to do, thank you for the help!

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I might add that it will also fail to boot when I attempt to cold boot. It gets stuck in a loop and the only way to make it boot at all is to go into recover mode, run first aid on the drive, then restart. It will run until I leave it idle for anything more than maybe ten minutes.

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I also have this problem its only manifest itself in the last 6-8 weeks or so

on my maxed out Macmini mid 2011 [5,2] i7 2.7 GHz

L2 Cache (per Core): 256 KB

L3 Cache: 4 MB

Memory: 16 GB

Boot ROM Version: 135.0.0.0.0

SMC Version (system): 1.75f0

I cannot identify what change may have triggered these rebooting cycles, apart from some incremental updates from Apple, as I've been running High Sierra on this machine for a long time now without other problems.

I did have one of my two 2TB Seagate FireCuda go bad a few months ago - maxing out its bad sectors allocation - so I replaced it with a Samsung EVO SSD 1TB - which I was used first as the primary boot drive - but when this rebooting behaviour began - subsequently trying to isolate causes I have created a Fusion Drive out of the 1TB SSD and the other Seagate 2TB HD - with a fresh install of 10.13.6

Now reboots often on return from sleep and boots 2-3 times on fresh start from shutdown before eventually reaching log-in screen

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I have an observation - and a theory {system as described above on Nov 20)- if I boot holding option key - my APSF formatted Fusion drive appears as two separate drives if I choose the first it boots normally ... if I choose the second it goes into a number 2/3 cycles of booting before finally coming up booting successfully in the main first volume ...

My conjecture/theory is that the second drive ikon represents the 'root' level APFS container 'volume' that perhaps contains elements of a recovery partition but reboots in attempts to pass the boot process to the main partition ...

Is it possible that returning from sleep the awakened software is making a similar redirection that results in a reboot rather than awakening in pre-sleep status ... ??

It is possible that this problem first appeared when I began to use APFS formatted SSD ... and has persisted through the creation of a Fusion drive ... ??

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Update - so far so good - I read a suggestion on another thread - about deleting cache files ... so I used Parallels Toolbox's component 'Clean Drive' and allowed it to clean up my Log Files and Cache Files ... and 'touch wood' so far I have had all 'clean' single boot and restart sequences sequences so far ...

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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.

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This was not the issue. I have replaced the power supply and there has been no clear change in the behavior of the device. Any other ideas?

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Per a conversation with @mayer I pulled the hard drive and booted to a fresh copy of sierra. It didn't take long for the issue to happen again even without the hard drive. This was after virus scanning. I assume that leaves only the logic board to replace?

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@lcryan Thanks for the call and trying what I suggested. This is not any easy one. How about a history of the machine, Source of the replacement power supply. Any other upgrade or part replacements. I need something to go on here.

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@mayer the ram is Crucial 16GB Kit (2 x 8GB) DDR3L-1600 1600 MT/S SODIMM Memory for Mac (CT2K8G3S160BM) that I added and I bought the power supply from eBay. http://m.ebay.com/itm/ORIGINAL-OEM-APPLE...

It was used, which I suppose might be the issue, it being bad, but I don't know. It's a tough one, sir.

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What was happening with the original power supply? Do you have the original RAM? Were you having the issue before you upgrades the RAM? How long have you had this unit?

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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).

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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!

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I'm also using Mojave. I wonder if they built their computer killer into that OS.

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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.

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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?

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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.

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i have the same problem with my mac mini 2011 and i don’t understand how apple can make this upgrates wich many computers it’s getting broke. until el os x capitan was fine but after it was just for distroy the computers,. i look on the youtube and some people have been fix this problem by change an a capacitor. Can be true? any solution?

Update (11/22/2018)

I think the motherboard is broken. Like MacBook Pro 2010 it had the same problem and I had to replace one capacitor, after works fine.

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The same problem here with MacMini 2011... Did you replace the capacitor yourself? I assume apple did for $$$?

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I am having the same problem guys, and it started … I don’t know why. I installed still the High Sierra, but noticed that was too slow and did not bring any new features. I went back to El Captain, which runs “perfectly”. but since about 2 months, the macmin keeps ramdonly restarting. In hardware did not touch since abot 3-4 years is running with the same one and as no changes, I can not believe something is wrong with it! Hardware is simple, works or not working.

I did a 2nd partition on the SSD and re-install new El Captain, without any external software, and it keeps doing it …

now my next step is erase completely the SSD, as hard as possible, and try to install the original Lion … and go from there, that I will do it this week, meanwhile I am assuring no loss of data before the erase operation

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I disagree with the power supply diagnosis. Unless you have set your power save options to restart after power fail, the machine will stay off. Mine does not stay off. None of the others reporting this issue claim it stays off.

I was having the random restart problem several times per day after updating to High Sierra. The suggestions above caused me to start thinking about what functionality might change across releases. I decided to look at Power Save options.

I disabled power save for both system and display (set it to Never). The problem has disappeared. I have been running for a week now without recurrence.

It appears that Apple has introduced misadventure into the Power Save behaviour of (at least) High Sierra on Mid-2011 Mac Minis.

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I would get to Mojave as HShas too many other issues.

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Well, then I am just not ready to abandon my 32-bit Adobe Suite.

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My mac mini 5,2 mid 2011 just needed a replacement memory card to solve this problem. It wouldn't run the in-built hardware diagnostics using the "D" key on restart and froze on the memory test every time. Because of this, I got another memory card and just replaced one, and ran the tests : - perfect. I must have got the faulty one first time. I removed the bottom memory card nearest the pcb because I reckoned it would get hotter than the one above it. Also I carefully cleaned the fan and ducts with a soft brush. So far so good !

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I have not tried the solution yet, but I will try it and come back here if it works!

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Having same issue, high Sierra 10.13.6 on a mid 2011 Mac mini.

So far, I’ve backed up all files to an external hard drive using time machine. Also wiped the OS drive for a fresh install. I’m currently migrating all old files all back to the fresh OS drive.

During this process, the Mac mini has restarted, so I’m guessing a fresh install isn’t the fix for me.

Im also seeing High Sierra is a common factor with the boot issue. I’m going to try and update to a newer os if it’s even possible. If not I’m guessing a hardware issue?

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It’s the motherboard. No matter what OS fresh install, the result is the same. New power supply, new ram, tried several different hard drives, all to no avail.

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Try disabling power save. Disabling power save fixed mine.

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Did anyone try this?

Mac mini Mid 2011 PRAM Battery Replacement

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I try it. Not helps.

i have been puttet the board on woven to 180 grades for 10 minutes. It was working fain until next day. I think their it’s bad one capacitor.

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Same problem here. The most strange part is, Windows 10 via Bootcamp works fine. As soon back on OSX, it start to crash again (sometimes when booting). That why I don’t think its a hardware problem.

I was that stupid to try to fix it by wiping the harddisk, why I don’t have windows anymore :(

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Thanks to droolinggeezer. Yes for the older mac mini, it need to disable all option to the power saver. It worked for me on the latest 2014 mac mini. Solved my rebooting issue after the fresh new hard drive (hd) installed. I thought the hd had issue but it’s not. It had the same issue with the new replaced hd. I am not sure why Apple does not know about this issue and do something to fix this issue? I will raise this issue the Apple tech support. They were on the phone with me for 1.5 hour trying to install and reinstall the macos operating system.

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Yes, disabling all power saving options was what solved the rebooting issue on my mid 2011 MacMini

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