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#52078 - 07/20/19 01:05 AM Unrequested system shutdown
grelber Offline


Registered: 08/05/09
Loc: North of 49th ||
For the past couple days, once I've turned off my Magic Mouse and put the system to sleep as usual (via short touch of power button) over night, the system shuts down completely — with no log or error message indicating why. DU indicates that nothing has gone awry.

Is this an omen of impending iMac failure? Or what?

Running El Capitan 10.11.6 on mid-2011 iMac 2.5 GHz Intel Core i5.

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#52079 - 07/20/19 02:33 AM Re: Unrequested system shutdown [Re: grelber]
jchuzi Online


Registered: 08/04/09
Loc: New York State
Sounds like you may need to reset SMC. Read How to reset the System Management Controller (SMC) on your Mac
_________________________
Jon

OS 10.14.6, iMac Retina 5K 27-inch, late 2014, 3.5 GHz Intel Core i5, 1 TB fusion drive, 16 GB RAM, Epson SureColor P600, Photoshop CC, Lightroom CC, MS Office 365

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#52081 - 07/20/19 05:28 AM Re: Unrequested system shutdown [Re: jchuzi]
joemikeb Online

Moderator

Registered: 08/04/09
Loc: Fort Worth, Texas
Are you certain you aren't holding the power button a touch too long and thereby triggering a shut down?
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joemikeb • moderator

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#52084 - 07/20/19 10:11 AM Re: Unrequested system shutdown [Re: grelber]
freelance Offline


Registered: 08/05/09
Loc: London, UK
See what happens if you first switch off your mouse, then sleep your Mac with the keyboard: CMD+ALT+eject key
_________________________
Mac Pro dual-2.4 GHz, 10.13.6, 24 Gb RAM, 250 Gb Samsung EVO SSD/Velocity Solo PCIe card, 2x3Tb Seagate HD, 1x3Tb Hitachi HD, Dell 2408WFP; Canon PIXMA iX6550; CanoScan 8800F; MacBook Air 1.8 Ghz, 8 Gb RAM, 10.14.6, 256 Gb SSD; Vodafone Home Hub/BT Wi-Fi Extender.

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#52085 - 07/20/19 10:26 AM Re: Unrequested system shutdown [Re: grelber]
artie505 Online


Registered: 08/04/09
Taking a different tack, I'll wonder if, perhaps, your power button has deteriorated after years of use?
_________________________
The new Great Equalizer is the SEND button.

In Memory Of Harv: Those who can make you believe absurdities can make you commit atrocities. ~Voltaire

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#52088 - 07/21/19 01:28 AM Re: Unrequested system shutdown [Re: artie505]
grelber Offline


Registered: 08/05/09
Loc: North of 49th ||
jon & joemikeb & freelance & artie: Many thanks.

No change in my short touch of power button, but since the following suggestion helped I think I'll just keep resetting the SMC in reserve.

The sleep keystroke combo (option-⌘-⏏) seems to do the job.

So, rather than tempting fate, I think I'll switch to that (for putting the iMac to sleep after turning off the Magic Mouse) and leave the power button alone except for booting.

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#52089 - 07/21/19 01:53 AM Re: Unrequested system shutdown [Re: grelber]
artie505 Online


Registered: 08/04/09
Why not just take the path of least resistance and use  > Sleep?
_________________________
The new Great Equalizer is the SEND button.

In Memory Of Harv: Those who can make you believe absurdities can make you commit atrocities. ~Voltaire

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#52090 - 07/21/19 02:01 AM Re: Unrequested system shutdown [Re: artie505]
grelber Offline


Registered: 08/05/09
Loc: North of 49th ||
Originally Posted By: artie505
Why not just take the path of least resistance and use  > Sleep?

With the Magic Mouse turned off, one can't access the drop down menu (as far as I know).
And if I do that with the MM turned on and then turn it off, it causes the iMac to wake up.

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#52091 - 07/21/19 02:13 AM Re: Unrequested system shutdown [Re: grelber]
artie505 Online


Registered: 08/04/09
Originally Posted By: grelber
Originally Posted By: artie505
Why not just take the path of least resistance and use  > Sleep?

With the Magic Mouse turned off, one can't access the drop down menu (as far as I know).
And if I do that with the MM turned on and then turn it off, it causes the iMac to wake up.

Sorry, I've got no experience with the Magic Mouse, so I thought you could save the "turn it off" step. I guess you turn it off for battery conservation?
_________________________
The new Great Equalizer is the SEND button.

In Memory Of Harv: Those who can make you believe absurdities can make you commit atrocities. ~Voltaire

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#52092 - 07/21/19 02:30 AM Re: Unrequested system shutdown [Re: grelber]
freelance Offline


Registered: 08/05/09
Loc: London, UK
Glad that worked for you.

I'm curious to know where you find those keystroke icons?
_________________________
Mac Pro dual-2.4 GHz, 10.13.6, 24 Gb RAM, 250 Gb Samsung EVO SSD/Velocity Solo PCIe card, 2x3Tb Seagate HD, 1x3Tb Hitachi HD, Dell 2408WFP; Canon PIXMA iX6550; CanoScan 8800F; MacBook Air 1.8 Ghz, 8 Gb RAM, 10.14.6, 256 Gb SSD; Vodafone Home Hub/BT Wi-Fi Extender.

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#52093 - 07/21/19 02:32 AM Re: Unrequested system shutdown [Re: grelber]
jchuzi Online


Registered: 08/04/09
Loc: New York State
Resetting SMC is very easy and has no adverse effects. I have done it with my iMac, and all it involves is shutting down completely, unplugging the iMac for a short time, and plugging it in again. If you have a power outage, the effect is the same.
_________________________
Jon

OS 10.14.6, iMac Retina 5K 27-inch, late 2014, 3.5 GHz Intel Core i5, 1 TB fusion drive, 16 GB RAM, Epson SureColor P600, Photoshop CC, Lightroom CC, MS Office 365

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#52095 - 07/21/19 02:52 AM Re: Unrequested system shutdown [Re: jchuzi]
artie505 Online


Registered: 08/04/09
And right on point:

What the SMC does
The SMC is responsible for these and other low-level functions on Intel-based Mac computers:
Responding to presses of the power button
_________________________
The new Great Equalizer is the SEND button.

In Memory Of Harv: Those who can make you believe absurdities can make you commit atrocities. ~Voltaire

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#52103 - 07/21/19 03:21 PM Re: Unrequested system shutdown [Re: freelance]
joemikeb Online

Moderator

Registered: 08/04/09
Loc: Fort Worth, Texas
Originally Posted By: freelance
Glad that worked for you.

I'm curious to know where you find those keystroke icons?

They are all over the place and often not easy to get to. In virtually all versions of MacOS  is achieved by Shift+Option+K (⇧⌥K). In Mojave and Catalina the rest can be found somewhere in Emoji & Symbols (∧⌘space). NOTE: Emoji & Symbols has two UIs. The default looks like this and you can find some of the symbols browsing here. However if you click where indicted you will get this view. For reasons known only to a few developers there are symbol sets available in the second view that do not appear in the first, specifically "Technical Symbols" which is what you are likely looking for. No the apple logo does not appear in either variety of emoji and symbols or at least I have never found it, but it is available on the keyboard as ⇧⌥K.
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joemikeb • moderator

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#52104 - 07/21/19 03:43 PM Re: Unrequested system shutdown [Re: joemikeb]
artie505 Online


Registered: 08/04/09
Thanks for pointing out the other view (Surely, they could have hidden it better! tongue ); I knew there was stuff missing.

I've got  from somewhere - The only place I can think of is an ooold symbols viewer...back in the days when it showed the entire Unicode sequence. - but it shows up in my favorites like so...whatever on Earth "PRIVATE USE AREA-F8FF" is.

More:
Originally Posted By: Private Use Areas - Wikipedia
In Unicode, a Private Use Area (PUA) is a range of code points that, by definition, will not be assigned characters by the Unicode Consortium.[1] Three private use areas are defined: one in the Basic Multilingual Plane (U+E000–U+F8FF), and one each in, and nearly covering, planes 15 and 16 (U+F0000–U+FFFFD, U+100000–U+10FFFD). The code points in these areas cannot be considered as standardized characters in Unicode itself. They are intentionally left undefined so that third parties may define their own characters without conflicting with Unicode Consortium assignments. Under the Unicode Stability Policy,[2] the Private Use Areas will remain allocated for that purpose in all future Unicode versions.
_________________________
The new Great Equalizer is the SEND button.

In Memory Of Harv: Those who can make you believe absurdities can make you commit atrocities. ~Voltaire

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#52105 - 07/21/19 11:26 PM Re: Unrequested system shutdown [Re: joemikeb]
freelance Offline


Registered: 08/05/09
Loc: London, UK
⌥⌘+⏏︎

Thanks!
_________________________
Mac Pro dual-2.4 GHz, 10.13.6, 24 Gb RAM, 250 Gb Samsung EVO SSD/Velocity Solo PCIe card, 2x3Tb Seagate HD, 1x3Tb Hitachi HD, Dell 2408WFP; Canon PIXMA iX6550; CanoScan 8800F; MacBook Air 1.8 Ghz, 8 Gb RAM, 10.14.6, 256 Gb SSD; Vodafone Home Hub/BT Wi-Fi Extender.

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#52107 - 07/22/19 05:48 AM Re: Unrequested system shutdown [Re: artie505]
joemikeb Online

Moderator

Registered: 08/04/09
Loc: Fort Worth, Texas
Originally Posted By: artie505
Thanks for pointing out the other view (Surely, they could have hidden it better! tongue ); I knew there was stuff missing.

I can't claim any genius in finding that. It was purely curiosity that caused me to check what that little icon up there at the right corner of the Character Viewer window did and voilá I struck gold. Instead of hiding it they could have shown the Technical Symbols in both views but perhaps with a warning that "Symbols on this page are not Unicode standard." My aggravation is I have not found a way to add symbols from the small view to the "Favorites list" in the default view 🤬. Nor have I found a way to add to the Favorites list 🤬🤬

Time to submit another suggestion.
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joemikeb • moderator

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#52113 - 07/22/19 03:48 PM Re: Unrequested system shutdown [Re: joemikeb]
artie505 Online


Registered: 08/04/09
I've got  in my Favorites list; I assume it's been there since the days when the Character Viewer displayed the entire Unicode sequence.

I'll be happy to send you the file if you can figure out where it lives.

I"m not sure why I never clicked on that icon, but then again, it took me a few years to learn to look for answers to questions by cruising the menu bar.

More: On second thought, isn't the key command much easier to use than the Emoji & Symbols pane?


Edited by artie505 (07/23/19 01:22 AM)
Edit Reason: More
_________________________
The new Great Equalizer is the SEND button.

In Memory Of Harv: Those who can make you believe absurdities can make you commit atrocities. ~Voltaire

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Moderator:  alternaut, dkmarsh, joemikeb