Apple STUMPED - iMac shuts off randomly, daily to multiple times/hour
iMac 27" 3.4 GHz i7 (Late 2012)
This iMac was my father's and began having this issue last summer. It will simply power off completely at random - sometimes being able to be powered back on immediately, sometimes not turning on for an hour. This problem persisted for months and grew more frequent until it was happening several times a day.
Rather than try to deal with it over long distance, I had him buy a new iMac and took the old one with me to NYC. Took to Apple, who found nothing wrong.
I reformatted the drive, did a new install and step up with new software in a completely new environment - I did NOT restore from any user or backup. Within a week the Mac started shutting off again.
I brought it to Apple again. They kept the machine this time and ran diagnostic over days but could not get it to repeat shut down in their possession and insisted it was a software issue. We rebuilt the machine once more and tried again. This time it worked for a few months before starting to shut down occasionally again. At first just every few days, then nearly daily (oddly often around the same time in the afternoon), and then multiple times a day.
I brought back to Apple once more and eventually spoke on the phone with a master tech somewhere in the Midwest who also thought the "Geniuses" must be missing something and gave them more stressful test to try. Again, they can't get the machine to replicate the problem.
- This machine has been rebuilt several times.
- This machine has been in two completely different environments, with different sets of software from different sources.
- I have swapped power cords. I have tried different surge protectors and outlets.
I am at a loss and Apple will not tell me anything is wrong to replace.
Except for the shutting off, this still remains one of the fastest Macs I've used from probably 15 different 27" models from 2010 - late 2015.
Any suggestions? Thank you very much.
I replaced the Power Supply for 125.00. Works great now. Apple has been no help in this issue.
由 artist2007 完成的
I’ve been dealing with the same for 5 years. Apple never finds anything wrong, get it back, still shuts down. Now they are whining about us requesting a new computer, on their dime, because of the age of the computer. My argument is that it has done this since 11 months old, now about 5, and I have almost never been able to use it during that time. They deny they have ever heard anything like this, yet I can find it all over Internet forums. I’m so frustrated! I’ll be purchasing some kind of crap laptop this coming week. I need a computer. But I’m done with apple products. (Even 3 of our 5 iPhones do the same thing).
由 spencer Gadbois 完成的
I had this same problem for the better part of 9 months (sometimes I'd get 5 shutdowns in an hour, and other times my iMac wouldn't shut down for days/weeks). Nobody on the forums I frequent had any solid ideas/suggestions about what might be causing this (I heard errant programs, kernel panics, etc., but none of those seemed to be the case).
Then I happened upon this article; lots of similarities to the problems I was encountering with this very specific iMac model.
I replaced the Power Supply about 3 weeks ago, and haven't had one shutdown since. At this point, I'm going to cast my vote for this being the problem/solution.
Word of caution: when peeling off the old adhesive from the back edges of the screen, don't be too aggressive. I applied a little too much pressure with my plastic widget/tool (don't know what it's really called), and wound up scraping off a little bit of the black paint on the backside of the screen, which leaves the glass bare (and noticeable when the machine is put back together).
由 Justin Griffin-Holst 完成的
I had this problem and lived with it for about 3 months - I had the power supply replaced and it corrected the problem.
由 Chris Ryan 完成的
Exact same problem. I have taken it in 3 times now and they cannot get it to do it. I will be working in illustrator or indesign and it just shuts down.
由 holloway 完成的