Mac mini 2018 Unexpectedly Reboots

Discussion in 'Mac mini' started by ethan-1878, Nov 27, 2018.

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  1. ethan-1878 macrumors member

    Joined:
    Jun 8, 2014
    #1
    Has anybody else experienced issues with their 2018 Mac mini rebooting unexpectedly?
    I could be in the middle of a design and the Mac locks up for a second and then reboots itself.

    Initially, I thought it was an issue with thermals as the Mac was getting very hot to the touch but the last few times it's happened I haven't noticed any excessive heat.

    I've noticed this happening on average about twice per week. My machine was BTO and the config is:

    • 3.2GHz 6‑core 8th‑generation Intel Core i7 (Turbo Boost up to 4.6GHz)
    • 8GB 2666MHz DDR4 (See below)
    • Intel UHD Graphics 630
    • 512GB SSD storage
    • Gigabit Ethernet (10/100/1000BASE-T Gigabit Ethernet using RJ-45 connector)
    I upgraded the RAM to 32GB my self using some Crucial memory.
     
  2. cococheaf macrumors demi-god

    cococheaf

    Joined:
    Jul 10, 2018
    Location:
    Austria - Lake of Constance
    #2
    i had the problem that the memory was getting too hot, thus triggering a thermal protection shutdown.
    i had the Kingston HyperX Impact SO-DIMM Kit 32GB, DDR4-3200, CL20-22-22 (HX432S20IBK2/32) kit installed.
    Exchanged it with some simple micron memory meeting the specs and it works like a charm since then.
     
  3. Fishrrman macrumors P6

    Fishrrman

    Joined:
    Feb 20, 2009
    #3
    Put the factory RAM back in and try it that way for a while...
     
  4. archer75 macrumors 68020

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    Jan 26, 2005
    Location:
    Oregon
    #4
    I have the same config, the same ram. But no issues.
     
  5. ethan-1878 thread starter macrumors member

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    Jun 8, 2014
    #5
    I considered trying this but thought I'd ask first. If I could identify an issue without taking the machine apart again, I could save myself some downtime.

    Did you upgrade your now ram? If so, what brand did you use?

    Maybe the memory then. I have Crucial CT2K16G4SFD8266 in there a the minute. I will revert back to stock memory for some time and if all goes well, I will swap out for the memory you've mentioned you're using. Can you provide me with a link to a product page for your memory? I've tried Amazon (I'm based in the UK) and I didn't get any results.
     
  6. F-Train, Nov 27, 2018
    Last edited: Nov 27, 2018

    F-Train macrumors 65816

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    Location:
    NYC & Newfoundland
    #7
    That has a different code from the memory that Crucial recommends. The photo below, from Crucial's web site, shows what it recommends:

    Screen Shot 2018-11-27 at 11.26.57 AM.png
     
  7. archer75 macrumors 68020

    Joined:
    Jan 26, 2005
    Location:
    Oregon
    #8
    I did upgrade my ram. Crucial CT2K16G4SFD8266, same as you. Per Microns response to several questions on amazon this is indeed fully compatible with the 2018 mac mini.
     
  8. F-Train macrumors 65816

    Joined:
    Apr 22, 2015
    Location:
    NYC & Newfoundland
    #9
    Sure enough, Micron does say, in response to Amazon questions, that the memory with that code will work.

    Here is the Crucial page that shows that memory: http://www.crucial.com/usa/en/ct2k16g4sfd8266

    When you check compatibility on that page with the 2018 Mac mini, you get a positive response, but the info that comes up is for CT13492047.
     
  9. vbctv macrumors 6502

    vbctv

    Joined:
    Sep 25, 2013
    Location:
    Cleveland, OH
    #10
    I have the base i3 version, and this has happened to me when using Android Studio, trying to use an emulator to test an app. The computer will freeze and you'll here it click, screen goes black and it just reboots itself. Then you get the window saying that an unexpected shutdown occurred...
     
  10. steffen84 macrumors newbie

    Joined:
    Nov 7, 2018
    #11
    Happens once to me, Screen goes black then reboots.
    Upgraded my ram to 16Gb Crucial CT2K8G4SFS8266.
    Have the i5 Version.
     
  11. DVD9 macrumors 6502a

    Joined:
    Feb 18, 2010
    #12
    It's not nice to cheat Apple out of their RAM profits.

    This will teach you!
     
  12. cococheaf macrumors demi-god

    cococheaf

    Joined:
    Jul 10, 2018
    Location:
    Austria - Lake of Constance
    #13
    interesting ... -> that's why apple is not anymore soldering the ram to the logicboard.
    because they want us to cheat them... hahahah -> sorry, i don't want to blame you but you know that post was absolute nonsense...
     
  13. ethan-1878 thread starter macrumors member

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    Jun 8, 2014
    #14
    Has anybody ordered their RAM directly from the Crucial website using their "Compatible Upgrades" tool? Their ram is a lot cheaper than the alternative Micron memory which is available here:

    https://www.amazon.co.uk/Micron-MTA...odimm+2666&dpPl=1&dpID=51ZaL+9b0cL&ref=plSrch

    I think I may try direct from crucial first, before paying an extra £100 on RAM. For what it's worth, I might as well have upgraded from the factory!
     
  14. SoCalReviews, Nov 29, 2018
    Last edited: Nov 29, 2018

    SoCalReviews macrumors 6502a

    Joined:
    Dec 31, 2012
    #15
    I had problems a long time ago mixing and trying to match RAM installed on PCs. I learned from experience that incompatible RAM that is not in matched pairs might seem to work at first but in the long run you can run into strange compatibility issues. A typical problem when using faulty or incompatible memory, unmatched pairs of RAM sticks or having a faulty disk drive is having random system reboots. If the problem disappears when using the stock RAM then there is likely a problem with the upgrade RAM you replaced it with.

    I have had some success with using matched pair RAM that I purchased online for my Macs and PCs (Kingston, Crucial/Micron, Corsair, etc.) but you don't always have an absolute guarantee knowing exactly what you are getting. I usually order RAM upgrades for my Mac direct from Crucial in matched pairs... Guaranteed compatibility when using the matched pair kit of RAM they recommend for your Mac and a lifetime warranty so that if you have a problem with the RAM in the future then they will replace it with the same or another compatible RAM pair kit they recommend.
     
  15. ethan-1878, Dec 3, 2018
    Last edited: Dec 3, 2018

    ethan-1878 thread starter macrumors member

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    Jun 8, 2014
    #16
    I ordered the RAM directly form Crucial using their compatible upgrades tool. RAM arrived this morning so I set about replacing the faulty RAM with the new RAM.

    I installed the new RAM and on first boot, only 1 stick was recognised. Shut down the machine, disassembled, reseated both sticks and now the machine won't turn on at all. I definitely haven't missed any connectors (I've followed the iFixit guide step by step, 3 times since it wouldn't power on) and it still won't power on.

    In case the RAM was causing it, I've swapped back to the RAM that the machine shipped with and low and behold, it powers on. Although it took a while to boot it got there eventually.
     
  16. ethan-1878 thread starter macrumors member

    Joined:
    Jun 8, 2014
    #17
    So, both RAM kits have been returned to their original vendors. Has anybody had any success with the crucial "compatible" RAM kits?

    The memory which @cococheaf linked above works for them but its considerably more expensive than the Crucial branded version.

    Any further input would be great appreciated and welcomed.
     
  17. Fishrrman macrumors P6

    Fishrrman

    Joined:
    Feb 20, 2009
    #18
    OP:

    With all the additional cost and trouble, how much -more- would it have cost to order RAM from Apple...? ;)
     
  18. ethan-1878 thread starter macrumors member

    Joined:
    Jun 8, 2014
    #19
    After upgrading RAM on older Macs (2012 and earlier!), I gathered it would be a breeze. This is something I's use to after all. Boy was I wrong!

    In the grand scheme of things, the ~£300 which I "saved" by upgrading the RAM myself wasn't worth it since I'm now back to 8GB and had to endure a couple of days downtime whilst I ran through troubleshooting. At least I got a refund on both RAM kits though!
     
  19. racerhomie macrumors 6502

    racerhomie

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    Aug 14, 2015
    #20
    Yeah ,blame apple for incomparable ram.
     
  20. philipma1957 macrumors 603

    philipma1957

    Joined:
    Apr 13, 2010
    Location:
    Howell, New Jersey
    #21
    Apple 2018 ram upgrade is a sad joke compared to dell optiplex ram upgrade.

    A screw driver and under five minutes the optiplex is done.

    Apple intended the ram to be a pita to upgrade.

    Won’t get into the nvme m.2 upgrade Apple can’t be done.

    Dell optiplex under five minutes do,it when you do the ram upgrade.

    I am old school and when i think of apples 1984 commercial and what they become it is truly sad.

    Poor Steve must turn over in his grave nightly.
     
  21. archer75, Mar 20, 2019
    Last edited: Mar 20, 2019

    archer75 macrumors 68020

    Joined:
    Jan 26, 2005
    Location:
    Oregon
    #22
    A torx driver and 5 minutes and I can replace the ram in the mini. It's not hard. And Steve wouldn't give two ****s if you could upgrade your ram.

    https://www.amazon.com/gp/product/B071H38422/ref=ppx_yo_dt_b_asin_title_o04_s00?ie=UTF8&psc=1
     
  22. racerhomie macrumors 6502

    racerhomie

    Joined:
    Aug 14, 2015
    #23
    NVMe SSDs are standard on Mac Mini. You can make an argument against iMac HDD .For Mac Mini external storage expansion is super easy with usb for cheap slow hdd storage or TB3 port for external SATA SSDs
     
  23. philipma1957 macrumors 603

    philipma1957

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    Apr 13, 2010
    Location:
    Howell, New Jersey
    #24
    cook and co are loving guys like you.:apple:
     
  24. TonyK macrumors 65816

    TonyK

    Joined:
    May 24, 2009
    #25
    I've upgraded ram in various minis through the years. Looked at the video for the 2018 and deciding to just pay for the upgraded system upfront. The new 2018 mini is for my wife and the fewer issues the better. All it takes is for the new memory to be bad to drive down any cost savings.
     

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27 November 27, 2018