Firebrandnire

Q: Late 2012 (27") (i5) iMac - Keeps shutting down!

Late 2012 (27") (i5) iMac - Keeps shutting down!

 

For the past three weeks I have experience my iMac shutting down for no apparent reasons.

 

Firstly I though it was simply a blown fuse which I replaced.

The problem has become more occurrent over the past week.

I even down graded to Mountain Lion to see if maybe it was the OS or software related, but the same thing happened.

I've since reinstalled El Capitan from a clean install, and still the problem persists.

 

    • I have removed the cable from behind the screen to reset the SMC (Which only helps temporary, but eventually  knocks off again)
    • I have tried a clean install of the OS
    • I have switched around the Ram sicks
    • I have reset the PRAM

 

there are time were the computer will stay on longer and times when it will only boot as far as the login screen then shut down.

 

Please could someone help me shed some light on this very frustrating issue....... And the thing is, this computer has been very rarely used since purchase.

 

 

Cheers!

Firebrand

iMac, OS X El Capitan (10.11.5), Late 2012 27" i5

Posted on Jul 13, 2016 3:07 PM

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Q: Late 2012 (27") (i5) iMac - Keeps shutting down!

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  • by Scatts570,

    Scatts570 Scatts570 Sep 9, 2016 8:37 AM in response to John Galt
    Level 1 (4 points)
    Sep 9, 2016 8:37 AM in response to John Galt

    I'm been having exactly the same issue for the last 6-9 months.

     

    Gave it to Apple for a week and they monitored it for 24hrs (even though I said sometimes it doesn't switch off for days and sometimes it'll switch off 3 times in an afternoon). They came back with 'no fault found'.

     

    I also had a memory cleaner app, but I removed that App months ago and the issue is still happening.

     

    I have wondered if it's an issue with the power supply to the property and the iMac being susceptible to minor fluctuations that may be present. (It acts the same in all power sockets). I plan to take it to work and try it there to rule out the power supply, or try and borrow a UPS.

     

    It's strange that it does seem to be the same issue with a particular model that a lot of people are experiencing.

  • by stella5,

    stella5 stella5 Sep 16, 2016 1:41 AM in response to Firebrandnire
    Level 1 (4 points)
    Sep 16, 2016 1:41 AM in response to Firebrandnire

    having had the same  problem as  listed  by  so many  users, `I have also  tried  many methods  to try  and stop my iMac shutting  down.  So far, the  best method I have  used  is to  start the  iMac in the  usual  way.  As soon  as the starting  sound  is  heard I press button  and  back  and close down  and then  start up immediately  again.  The shutting  down does  not happen again on that day.  I have  been  doing this  for a few weeks and so far, so good

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