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wgscott

"Everything Apple"? iMac issues

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This may be off-topic (sorry), but since "everything apple" is in the forum title, I shall ask for your indulgence.

 

I have a 2013 iMac that lately (today) developed a repeated habit of powering off, seemingly at random.  The only way i can reboot it is if I wait about 10 or 15 minutes, pull the power cord out, and then plug it back in.  Only then can I power it on.

 

In a desperate attempt to convince myself it might be a software issue, I "upgraded" it to the high Sierra public beta #1 (which is dog-slow btw).  The issue persists.  It doesn't seem to correlate with anything (high CPU, etc) and for some reason didn't happen during the upgrade (which includes a file system reformatting).  

 

I'm guessing a faulty power supply or thermal sensor, but I have no idea.

 

Any suggestions?

 

 

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Yes, I would suggest resetting the PRAM (NVRAM) and SMC first. If that doesn't fix things, you'll need to get it checked out. It could be some component in the computer that's getting too hot.

 

https://support.apple.com/en-gb/HT201295

 

https://support.apple.com/en-gb/HT204063


I write about Macs, music, and more at Kirkville.

Author of Take Control of macOS Media Apps

Co-host of The Next Track podcast.

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I zapped the PRAM and then it wouldn't boot until I reinstalled from the recovery partition.  The problem, if anything, has gotten worse.  I think it is  time to take it to the Moron Bar.

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38 minutes ago, wgscott said:

I think it is  time to take it to the Moron Bar

I hadn't heard that one before.  I like it.


NUC7PJYH/AL --> Berkeley Alpha USB --> Jeff Rowland Aeris --> Jeff Rowland 625 S2 --> Focal Utopia 3 Diablos with 2 x Focal Electra SW 1000 BE subs

 

i7-6700K/Windows 10 Version 1903/HDPLEX 200W/HDPLEX 400W DC-ATX --> EVGA Nu Audio Card --> Focal CMS50's 

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I had an older iMac which also developed this problem.  I took it in and they diagnosed power supply was at fault. YMMV, of course.


2013 MacBook Pro Retina -> {Pure Music | Audirvana} -> {Dragonfly Red v.1} -> AKG K-702 or Sennheiser HD650 headphones.

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2 hours ago, flatmap said:

I had an older iMac which also developed this problem.  I took it in and they diagnosed power supply was at fault. YMMV, of course.

 

I'm guessing it is this.  Oddly, I can compile stuff and make huge demands on the processors, remotely, but it seems to power off when I do something like click a tab in Safari.

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2 hours ago, Ralf11 said:

time for an Imac Pro?

 

Only if someone else pays.

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3 hours ago, rickca said:

I hadn't heard that one before.  I like it.

 

By that I mean sometimes they seem to know even less than I do.

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1 hour ago, wgscott said:

 

Only if someone else pays.

 

that's why we have grants (or half-grants after 'they' take 'their' half)

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8 hours ago, wgscott said:

Oddly, I can compile stuff and make huge demands on the processors, remotely, but it seems to power off when I do something like click a tab in Safari.

 

That seems to rule out temperature issues, but if you want to investigate that anyway, try:

https://www.crystalidea.com/macs-fan-control

 

Is it just Safari?  I get kernel panics from time to time in Safari.

 

 


Mac Mini (2012 i7) > HQPlayer or Audirvana > exaSound e32 > Parasound JC-1 > Thiel 3.7

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On 6/30/2017 at 9:46 PM, wgscott said:

This may be off-topic (sorry), but since "everything apple" is in the forum title, I shall ask for your indulgence.

 

I think Chris should rename this forum to be just iTunes, not "everything Apple", consistent with the scope of Kirk's original forum.  I think the Software forum is more appropriate for non-iTunes issues.  


Mac Mini (2012 i7) > HQPlayer or Audirvana > exaSound e32 > Parasound JC-1 > Thiel 3.7

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6 hours ago, Bob Stern said:

 

I think Chris should rename this forum to be just iTunes, not "everything Apple", consistent with the scope of Kirk's original forum.  I think the Software forum is more appropriate for non-iTunes issues.  

 

Well, this is admittedly off-topic.  I think if it were only iTunes, a lot of us might not pay attention, if we use other player software.  

 

6 hours ago, Bob Stern said:

 

That seems to rule out temperature issues, but if you want to investigate that anyway, try:

https://www.crystalidea.com/macs-fan-control

 

Is it just Safari?  I get kernel panics from time to time in Safari.

 

 

 

Thanks for the link.  I will give it a try.  No, the shutoffs are random, and they are not kernel panics.  It is as if someone pulled the cord.  No trace in any log files or crash reports.  The extended hardware tests, and disk check, all report that there are no apparent hardware issues.  Again, I suspect it is the power supply.  Given our third-world electrical supply, it wouldn't surprise me...

 

Looks ok:

 

Screen Shot 2017-07-02 at 7.48.30 AM.png

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I had a similar issue with a Mac Pro.

 

After resenting everything the problem didn't go away.

 

Solution:

 

Shut down.

Disconnect all the peripherals.

Disconnect the power power cord for about 20 minutes.

 

Connect the power cord.

Restart zapping P-RAM.

Connect all the peripherals.

 

Good luck!

 

Roch

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Well, as I was packing it up this morning to take it in, I saw the power cable had been chewed -- puppy teeth marks.  But it isn't clear to me she got down to the wire, and it must have been well over a year ago, but in any case I am trying with a different cable, just in case.

 

#CablesMatter

 

 

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I usually leave a phone cable lying around for a puppy to chew - it is a minor correction to teach not to chew cables, as some can be lethal.

 

Anyway, you can bronze the cable and put it on your fireplace mantle...

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I pulled it apart to see if she managed to penetrate the insulation.  I cannot see any evidence that she did, but since I switched cables, no shutdowns (yet).  Plus she has had her adult teeth more than a year.  I am unconvinced.

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13 minutes ago, Ralf11 said:

pics of the perp?

 

If you insist ...

 

25055804035_e5bc48d09c_k.jpg 

 

 

25410632024_82600358cb_k.jpg 

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very cute!

 

- here is my golden from 2.5 years ago...

 

 

 

at base of flowers.JPG

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He's from So. Washington and has a very blocky stop (forehead) - he actually looks a lot like a blonde Newfie, and some say that Newfoundlands were used in Lord Tweedsmouth's breeding program.  

 

110 lbs. of rambunctious affection

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