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69 posts

Master Geek


# 250567 16-May-2019 15:12
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I have a late 2012 27" iMac, running OSX 10.14.4.

 

A few weeks ago it started randomly shutting off. Not like a shutdown or restart process. More like a power failure. Instant off. It only did it a few times over a few days and then stopped doing it for many weeks. I thought it was gone. 

 

Now it's back and it's back with a vengeance. Today it's powered off about 10 times! Sometimes it powers off during startup directly after the last power down (when switching from white startup screen to the account selection/login screen). Other times it powers off at seemingly random times during work - there isn't a specific action that triggers it.

Once it loses power, the only way to get it started again it to unplug the power cord for a while, and then plug it back in and turn on.

 

Is my power supply dying? How can I tell what's at fault?

 

Clearly with a machine this old I'm due for an upgrade soon anyway. So I don't want to invest in an expensive repair. But if it was an easy fix, that would be worth it. Otherwise, it looks like I might need to order a new one ASAP as I can't get any work done like this.

 

Any advice much appreciated.


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  # 2239353 16-May-2019 16:48
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Probably power supply is dying - dried out caps is the likely culprit.




69 posts

Master Geek


  # 2239355 16-May-2019 16:50
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Anything I can do to keep it working for a few more days while I order a replacement? At the moment it's shutting off more often than once per hour.


 
 
 
 


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  # 2239357 16-May-2019 16:55
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Not really - they can be temperature sensitive, so a change in the weather could be the final straw.


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  # 2239360 16-May-2019 16:56
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Benek:

 

Anything I can do to keep it working for a few more days while I order a replacement? At the moment it's shutting off more often than once per hour.

 

 

Probably the only thing you can do is to unplug as many USB devices as possible, or put them on a powered hub,

 

But realistically your options are pretty limited... it sounds like its on its way out...

 

Edit: as mentioned above temp could have an impact, so opening a window to lower the ambient might help to lower the fan load 




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Master Geek


  # 2239361 16-May-2019 16:56
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Do you know if hot or cold is better?


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  # 2239382 16-May-2019 17:23
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It can go either way - excess heat leads to failure, but once faulty, they can go either way. Some like to be warm, others don't.


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Master Geek
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  # 2239487 16-May-2019 19:22
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Note it could be CPU or Graphics overheating/intermittent i.e. not cooling, a Mac will switch off if these overheat to protect them from burn out.


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  # 2239490 16-May-2019 19:28
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Could also be the crap powerlead that some of them came with for a while. No strain relif like the junk cables for iphones, so prone to bend damage.





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  # 2239505 16-May-2019 20:14
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Pulling the plug out of the back of the iMac and leaving it out for 15 seconds or more may help as it resets the SMC which is the power management. TBH I doubt it will help but it is easy to do so may as well give it a go. Your mac is vintage so the chances of getting it repaired if it needs parts are greatly reduced.








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Master Geek


  # 2239511 16-May-2019 20:26
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Brumfondl:

 

Pulling the plug out of the back of the iMac and leaving it out for 15 seconds or more may help as it resets the SMC which is the power management. TBH I doubt it will help but it is easy to do so may as well give it a go. Your mac is vintage so the chances of getting it repaired if it needs parts are greatly reduced.

 

 

Yep. That's what I have to do every single time is dies before it will allow me to power it up again.


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