2012 Mini randomly shutting down and rebooting

Discussion in 'Mac mini' started by Jaze, Nov 23, 2012.

  1. Jaze macrumors member

    Sep 5, 2001
    Title pretty much says it all. If I'm not using the computer, the thing seems to randomly shut down and reboot every hour or so. Sometimes, if the computer is sleeping, when I press on the keyboard or trackpad to wake it, it shuts down instead of opening up. It's never shut down while I'm using it.

    This is a replacement Mini - I returned the first because of the snow screen issue, and because it was randomly shutting down.

    This is the midrange model, upgraded to 2.6GHz, with 1TB Fusion drive. I upgraded to 16GB RAM with Crucial chips; I re-used the chips in this replacement.

    I don't know if this means anything, but in the Energy preferences panel, I selected the "Start up after power outage" option, so now the thing reboots up after shutting down. I don't know if that means this is a power issue, but I feellike it would be weird for the same issue to develop in two new computers, particularly when I haven't seen others reporting this.

    Any suggestions?

  2. Jaze thread starter macrumors member

    Sep 5, 2001
    This may be unrelated, but sometimes I have problems getting the BLuetooth to connect; with the same wireless trackpad and keyboard, this wasn't an issue with the original Mini.
  3. fa8362 macrumors 65816

    Jul 7, 2008
    Don't select that.
  4. Jaze thread starter macrumors member

    Sep 5, 2001
    I have now un-selected it. Any particular reason?


    I should add that it was shutting down and rebooting *before* I selected it.
  5. xlii macrumors 68000


    Sep 19, 2006
    Millis, Massachusetts
    It shouldn't be turning off like that. Sounds like it's time to return it.
  6. Jaze thread starter macrumors member

    Sep 5, 2001
    Well, I do recognize that this isn't right. But I'm wondering if there's anything obvious here that I should do before I send it back in again. Could this be the RAM I added? I had this problem with the original machine, and transferred the same RAM into the new machine.

    Because I seem to be the only one reporting this problem here, I'm thinking it might not be the machine itself.
  7. Jaze thread starter macrumors member

    Sep 5, 2001
    Well, I certainly have the display problem, except that on my screen it manifests as snow, which resolves after I turn the unit off and on again.

    But the bigger problem is the shutting down and rebooting, which I haven't seen reported here.
  8. LaunchpadBS macrumors 6502a

    Nov 11, 2008
    Aside from the obvious, try putting the original ram back in and resetting the pram, if the problem persists try reinstalling the OS, short of that I'd take it back and get it replaced.
    The restarting thing sounds like is could be a memory issue.
  9. gnasher729 macrumors P6


    Nov 25, 2005
    "The RAM you added" can of course cause all kinds of problems, including random shut downs, including random crashes or shut downs when you are not using it. I'd try without the RAM, because clearly if the RAM is the problem, then exchanging the Mac will not fix it.
  10. gnasher729 macrumors P6


    Nov 25, 2005
    The display problem (just noise on the screen, nothing can be recognised at all) does suspiciously sound like the HDCP chip in your computer and the HDCP chip in your monitor disagreeing with each other. Two possible reasons: Your Mac's HDCP chip doesn't work properly, or your monitor's HDCP chip doesn't work properly. In the second case, a new Mac won't solve the problem.
  11. Jaze thread starter macrumors member

    Sep 5, 2001
    Thanks, all.

    I've popped the new RAM, put the old RAM back in, and... I can't get the wireless trackpad to pair with the computer. I'm charging up the batteries now. I'll pick up a new USB mouse later - this is ridiculous.

    The whole thing is ridiculous, really. I'd been waiting for a new iMac, and that's been endlessly deferred, plus I think it looks kind of iffy, so I spent $2000-plus on a loaded Mini and fantastic 27" NEC monitor recommended for colour-critical applications (in my case, photography). THe monitor IS amazing, but the Mini has let me down at every turn. I'm hoping it's the Crucial RAM I added.

    We shall see. Someday.

    Oh,and that's the first time I've seen or thought of "Gnasher" in probably 20 years!
  12. Cave Man macrumors 604

    Cave Man

    Feb 12, 2007
    Neander Valley, Germany; just outside Duesseldorf
    This happened to me many years ago with a first iteration Intel Mac Mini and I traced it to a faulty DIMM. OWC replaced it at no expense to me and the problem went away.
  13. Jaze thread starter macrumors member

    Sep 5, 2001
    Well, running with the original Apple native 4GB RAM now- Bluetooth finally connected. So far so good.

    Let's see how the day goes...
  14. LaunchpadBS macrumors 6502a

    Nov 11, 2008
    Send ur ram back, try some corsair vengeance if you can get a refund.
    I've seen a lot of reports of issues with the crucial ram unfortunately
  15. Jaze thread starter macrumors member

    Sep 5, 2001
    So far, so good. Came home to find the machine apparently off; thought, oh no, here we go again; one click on the trackpad, and I'm back in action.
  16. Jaze thread starter macrumors member

    Sep 5, 2001
    Dammit all to hell! The Mini is shutting down again - and this after I'd written a sternly-worded letter to Crucial!

    How do I reinstall the OS on this? It came with OS 10.8 pre-loaded.
  17. LaunchpadBS macrumors 6502a

    Nov 11, 2008
    Have you reset the Pram?
  18. Jaze thread starter macrumors member

    Sep 5, 2001
    I have.

    Although at the moment I have no input access - the keyboard will connect wirelessly, but the computer finds the trackpad, then fails to connect. It's interesting - it identifies the trackpad as "JHMacbook Air Trackpad" - apparently at one point I used it with my Macbook Air. This persists even after I remove and replace the batteries. I don't know if it's a big issue, since it was connecting with it just fine earlier in the day.

    Right now the computer is on - it's been on all night, the display lit up, with the "Cannot find a mouse or trackpad" error message.

    I'm wondering if this could all be a BLuetooth issue. I'm going to go down to Apple and buy another USB wired keyboard and mouse this morning, and spend some quality time on the phone with Apple. If they can't sort it out by 3PM, it's going back to them - here, the Post Office closes at 4PM.
  19. Dduval macrumors regular

    Nov 12, 2012

    Yes, send it back, you have more patience than I have. Hope all turns out well.
  20. nperei macrumors member

    Jun 27, 2010
    try double check your outlet. make sure it secure or plug into different outlet
    don't use secure protect for a while. Just test it

    We wondering if you have upgrade memory or hard drive ?
  21. Jaze thread starter macrumors member

    Sep 5, 2001
    Well, as it turns out, the problem was... (drumroll)... my powered USB hub. I removed all the external drives I had attached, then added them back one by one. The weak link was my Medialink USB hub. Everything worked fine until I plugged it back in, then the exact same problem recurred.

    Now I have to figure out how to handle the four drives, Wacom tablet and USB charging/connecting cables for my iPhone, iPods and iPad, and the CFC reader.

    Still, at least the bloody thing WORKS! Time to put the extra RAM back in...

    thanks for playing along at home!
  22. michaelwell macrumors newbie


    Oct 11, 2015
    I have the same symptom as yours.

    My machine is Mac mini 2011 with ATI Radeon.

    repeat random reboot, and difficutly boot to login page.

    I had tried everything, replace Ram, Hardrdrive, Monitor, and even the OS system from El Capitan, Yosemite, Maverick to Mountain Lion. Nothing helped.

    Today the problem was solved.

    You can try to tear down the mac mini, and replace the Mercury Battery 2032 that came with the machine.

    I replace it and than my machine became normal and stable again !

    Good Luck !
  23. EncryptedUser, Jan 6, 2016
    Last edited: Jan 7, 2016

    EncryptedUser macrumors newbie

    Nov 9, 2008

    I've been suffering from this the last couple of weeks as well.

    Same 2011 Mini with Radeon graphics.
    Spontaneous reboots, in the beginning it could run a couple of hours before a reboot but now it barely manage to reach the login window.
    Only way it was stable was during safe boot.
    I ripped it apart and tried every hardware trick I know - short of replacing the battery.

    I even began searching for pre-owned ones to buy.

    Tomorrow I need to pick up a 2032 battery and try replacing it. :D
    Cant get any worse.

    Will post an update when its done.


    Nope. Replacing the battery did not work for me. :(
    So I'm off to buy a another one.

  24. EncryptedUser macrumors newbie

    Nov 9, 2008

Share This Page