iMac turned itself on after power was cut












6














I left my computer sleeping but turned off the power by accident. Hours after the power was turned back on the computer booted itself up. It is plugged into a UPS. I don't understand how this could happen.






imac







share|improve this question









New contributor




Debra is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.




















  • Is the "start on power" selected in the system preferences? if so it will start on getting power...
    – Solar Mike
    2 days ago










  • December 30, 2018. Skynet becomes self aware.
    – Terminator
    2 days ago
















6














I left my computer sleeping but turned off the power by accident. Hours after the power was turned back on the computer booted itself up. It is plugged into a UPS. I don't understand how this could happen.






imac







share|improve this question









New contributor




Debra is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.




















  • Is the "start on power" selected in the system preferences? if so it will start on getting power...
    – Solar Mike
    2 days ago










  • December 30, 2018. Skynet becomes self aware.
    – Terminator
    2 days ago














6












6








6







I left my computer sleeping but turned off the power by accident. Hours after the power was turned back on the computer booted itself up. It is plugged into a UPS. I don't understand how this could happen.






imac







share|improve this question









New contributor




Debra is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.











I left my computer sleeping but turned off the power by accident. Hours after the power was turned back on the computer booted itself up. It is plugged into a UPS. I don't understand how this could happen.






imac




imac






share|improve this question









New contributor




Debra is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.











share|improve this question









New contributor




Debra is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.









share|improve this question




share|improve this question








edited 2 days ago









wizzwizz4

1086




1086






New contributor




Debra is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.









asked Dec 31 '18 at 7:33









Debra

311




311




New contributor




Debra is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.





New contributor





Debra is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.






Debra is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.












  • Is the "start on power" selected in the system preferences? if so it will start on getting power...
    – Solar Mike
    2 days ago










  • December 30, 2018. Skynet becomes self aware.
    – Terminator
    2 days ago


















  • Is the "start on power" selected in the system preferences? if so it will start on getting power...
    – Solar Mike
    2 days ago










  • December 30, 2018. Skynet becomes self aware.
    – Terminator
    2 days ago
















Is the "start on power" selected in the system preferences? if so it will start on getting power...
– Solar Mike
2 days ago




Is the "start on power" selected in the system preferences? if so it will start on getting power...
– Solar Mike
2 days ago












December 30, 2018. Skynet becomes self aware.
– Terminator
2 days ago




December 30, 2018. Skynet becomes self aware.
– Terminator
2 days ago










1 Answer
1






active

oldest

votes


















7














On the iMac, there's a setting under System Preferences > Energy Saver called Start up automatically after a power failure, which I'm guessing will be selected on your system, and hence would explain your computer's spontaneous rebooting.



If you don't wish this to happen in the event of a power failure, or the next time you turn off the power by accident, then uncheck that particular option.



Energy Saver Preferences on macOS, SierraNote: Screenshot taken on macOS 10.12.6 (Sierra)



As Tetsujin very helpfully points out in the comments below, there is also a button in the bottom right of the Energy Saver preferences pane labelled "Schedule...", which allows the user to regulate when the computer starts up, wakes up, or goes to sleep. It would be wise to double check your settings there too.






share|improve this answer



















  • 1




    There's also the Schedule, bottom right, which could potentially explain why it switched on hours later.
    – Tetsujin
    2 days ago






  • 1




    Thanks @Tetsujin. I misread the OP as saying "Hours_later_, the power was turned back on...". I'll add your comment to the answer, as it's a very pertinent detail.
    – CJK
    2 days ago






  • 1




    There is also the remote possibility that the UPS spent the first few hours recharging before pushing power to the Mac, but I don't know enough about UPS to know if that's a valid suggestion.
    – Tetsujin
    2 days ago










  • @Tetsujin yes, for a ups that can happen - depends how it can be configured... sure the answer will get updated to include that...
    – Solar Mike
    2 days ago











Your Answer








StackExchange.ready(function() {
var channelOptions = {
tags: "".split(" "),
id: "118"
};
initTagRenderer("".split(" "), "".split(" "), channelOptions);

StackExchange.using("externalEditor", function() {
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled) {
StackExchange.using("snippets", function() {
createEditor();
});
}
else {
createEditor();
}
});

function createEditor() {
StackExchange.prepareEditor({
heartbeatType: 'answer',
autoActivateHeartbeat: false,
convertImagesToLinks: false,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: null,
bindNavPrevention: true,
postfix: "",
imageUploader: {
brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
allowUrls: true
},
onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
});


}
});






Debra is a new contributor. Be nice, and check out our Code of Conduct.










draft saved

draft discarded


















StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fapple.stackexchange.com%2fquestions%2f347122%2fimac-turned-itself-on-after-power-was-cut%23new-answer', 'question_page');
}
);

Post as a guest















Required, but never shown

























1 Answer
1






active

oldest

votes








1 Answer
1






active

oldest

votes









active

oldest

votes






active

oldest

votes









7














On the iMac, there's a setting under System Preferences > Energy Saver called Start up automatically after a power failure, which I'm guessing will be selected on your system, and hence would explain your computer's spontaneous rebooting.



If you don't wish this to happen in the event of a power failure, or the next time you turn off the power by accident, then uncheck that particular option.



Energy Saver Preferences on macOS, SierraNote: Screenshot taken on macOS 10.12.6 (Sierra)



As Tetsujin very helpfully points out in the comments below, there is also a button in the bottom right of the Energy Saver preferences pane labelled "Schedule...", which allows the user to regulate when the computer starts up, wakes up, or goes to sleep. It would be wise to double check your settings there too.






share|improve this answer



















  • 1




    There's also the Schedule, bottom right, which could potentially explain why it switched on hours later.
    – Tetsujin
    2 days ago






  • 1




    Thanks @Tetsujin. I misread the OP as saying "Hours_later_, the power was turned back on...". I'll add your comment to the answer, as it's a very pertinent detail.
    – CJK
    2 days ago






  • 1




    There is also the remote possibility that the UPS spent the first few hours recharging before pushing power to the Mac, but I don't know enough about UPS to know if that's a valid suggestion.
    – Tetsujin
    2 days ago










  • @Tetsujin yes, for a ups that can happen - depends how it can be configured... sure the answer will get updated to include that...
    – Solar Mike
    2 days ago
















7














On the iMac, there's a setting under System Preferences > Energy Saver called Start up automatically after a power failure, which I'm guessing will be selected on your system, and hence would explain your computer's spontaneous rebooting.



If you don't wish this to happen in the event of a power failure, or the next time you turn off the power by accident, then uncheck that particular option.



Energy Saver Preferences on macOS, SierraNote: Screenshot taken on macOS 10.12.6 (Sierra)



As Tetsujin very helpfully points out in the comments below, there is also a button in the bottom right of the Energy Saver preferences pane labelled "Schedule...", which allows the user to regulate when the computer starts up, wakes up, or goes to sleep. It would be wise to double check your settings there too.






share|improve this answer



















  • 1




    There's also the Schedule, bottom right, which could potentially explain why it switched on hours later.
    – Tetsujin
    2 days ago






  • 1




    Thanks @Tetsujin. I misread the OP as saying "Hours_later_, the power was turned back on...". I'll add your comment to the answer, as it's a very pertinent detail.
    – CJK
    2 days ago






  • 1




    There is also the remote possibility that the UPS spent the first few hours recharging before pushing power to the Mac, but I don't know enough about UPS to know if that's a valid suggestion.
    – Tetsujin
    2 days ago










  • @Tetsujin yes, for a ups that can happen - depends how it can be configured... sure the answer will get updated to include that...
    – Solar Mike
    2 days ago














7












7








7






On the iMac, there's a setting under System Preferences > Energy Saver called Start up automatically after a power failure, which I'm guessing will be selected on your system, and hence would explain your computer's spontaneous rebooting.



If you don't wish this to happen in the event of a power failure, or the next time you turn off the power by accident, then uncheck that particular option.



Energy Saver Preferences on macOS, SierraNote: Screenshot taken on macOS 10.12.6 (Sierra)



As Tetsujin very helpfully points out in the comments below, there is also a button in the bottom right of the Energy Saver preferences pane labelled "Schedule...", which allows the user to regulate when the computer starts up, wakes up, or goes to sleep. It would be wise to double check your settings there too.






share|improve this answer














On the iMac, there's a setting under System Preferences > Energy Saver called Start up automatically after a power failure, which I'm guessing will be selected on your system, and hence would explain your computer's spontaneous rebooting.



If you don't wish this to happen in the event of a power failure, or the next time you turn off the power by accident, then uncheck that particular option.



Energy Saver Preferences on macOS, SierraNote: Screenshot taken on macOS 10.12.6 (Sierra)



As Tetsujin very helpfully points out in the comments below, there is also a button in the bottom right of the Energy Saver preferences pane labelled "Schedule...", which allows the user to regulate when the computer starts up, wakes up, or goes to sleep. It would be wise to double check your settings there too.







share|improve this answer














share|improve this answer



share|improve this answer








edited 2 days ago

























answered 2 days ago









CJK

2,658114




2,658114








  • 1




    There's also the Schedule, bottom right, which could potentially explain why it switched on hours later.
    – Tetsujin
    2 days ago






  • 1




    Thanks @Tetsujin. I misread the OP as saying "Hours_later_, the power was turned back on...". I'll add your comment to the answer, as it's a very pertinent detail.
    – CJK
    2 days ago






  • 1




    There is also the remote possibility that the UPS spent the first few hours recharging before pushing power to the Mac, but I don't know enough about UPS to know if that's a valid suggestion.
    – Tetsujin
    2 days ago










  • @Tetsujin yes, for a ups that can happen - depends how it can be configured... sure the answer will get updated to include that...
    – Solar Mike
    2 days ago














  • 1




    There's also the Schedule, bottom right, which could potentially explain why it switched on hours later.
    – Tetsujin
    2 days ago






  • 1




    Thanks @Tetsujin. I misread the OP as saying "Hours_later_, the power was turned back on...". I'll add your comment to the answer, as it's a very pertinent detail.
    – CJK
    2 days ago






  • 1




    There is also the remote possibility that the UPS spent the first few hours recharging before pushing power to the Mac, but I don't know enough about UPS to know if that's a valid suggestion.
    – Tetsujin
    2 days ago










  • @Tetsujin yes, for a ups that can happen - depends how it can be configured... sure the answer will get updated to include that...
    – Solar Mike
    2 days ago








1




1




There's also the Schedule, bottom right, which could potentially explain why it switched on hours later.
– Tetsujin
2 days ago




There's also the Schedule, bottom right, which could potentially explain why it switched on hours later.
– Tetsujin
2 days ago




1




1




Thanks @Tetsujin. I misread the OP as saying "Hours_later_, the power was turned back on...". I'll add your comment to the answer, as it's a very pertinent detail.
– CJK
2 days ago




Thanks @Tetsujin. I misread the OP as saying "Hours_later_, the power was turned back on...". I'll add your comment to the answer, as it's a very pertinent detail.
– CJK
2 days ago




1




1




There is also the remote possibility that the UPS spent the first few hours recharging before pushing power to the Mac, but I don't know enough about UPS to know if that's a valid suggestion.
– Tetsujin
2 days ago




There is also the remote possibility that the UPS spent the first few hours recharging before pushing power to the Mac, but I don't know enough about UPS to know if that's a valid suggestion.
– Tetsujin
2 days ago












@Tetsujin yes, for a ups that can happen - depends how it can be configured... sure the answer will get updated to include that...
– Solar Mike
2 days ago




@Tetsujin yes, for a ups that can happen - depends how it can be configured... sure the answer will get updated to include that...
– Solar Mike
2 days ago










Debra is a new contributor. Be nice, and check out our Code of Conduct.










draft saved

draft discarded


















Debra is a new contributor. Be nice, and check out our Code of Conduct.













Debra is a new contributor. Be nice, and check out our Code of Conduct.












Debra is a new contributor. Be nice, and check out our Code of Conduct.
















Thanks for contributing an answer to Ask Different!


  • Please be sure to answer the question. Provide details and share your research!

But avoid …



  • Asking for help, clarification, or responding to other answers.

  • Making statements based on opinion; back them up with references or personal experience.


To learn more, see our tips on writing great answers.





Some of your past answers have not been well-received, and you're in danger of being blocked from answering.


Please pay close attention to the following guidance:


  • Please be sure to answer the question. Provide details and share your research!

But avoid …



  • Asking for help, clarification, or responding to other answers.

  • Making statements based on opinion; back them up with references or personal experience.


To learn more, see our tips on writing great answers.




draft saved


draft discarded














StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fapple.stackexchange.com%2fquestions%2f347122%2fimac-turned-itself-on-after-power-was-cut%23new-answer', 'question_page');
}
);

Post as a guest















Required, but never shown





















































Required, but never shown














Required, but never shown












Required, but never shown







Required, but never shown

































Required, but never shown














Required, but never shown












Required, but never shown







Required, but never shown







-

Popular posts from this blog

"Incorrect syntax near the keyword 'ON'. (on update cascade, on delete cascade,)

Image
.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty{ height:90px;width:728px;box-sizing:border-box; } 2 total noob sorry any help greatly appreciated. I keep getting this "Incorrect syntax near the keyword 'ON'." heres my codes code one CREATE TABLE supplier ( supplierID INT PRIMARY KEY, ISBN INT FOREIGN KEY REFERENCES book(ISBN), price DECIMAL (5,2), ON UPDATE CASCADE, ON DELETE CASCADE, ); code two CREATE TABLE orders ( orderID INT PRIMARY KEY, customerID INT FOREIGN KEY REFERENCES customer(customerID), ISBN INT FOREIGN KEY REFERENCES book(ISBN), orderDate date, ON UPDATE CASCADE, ON DELETE CASCADE, ); Ive run out of stuff to try other than dumbing it down to uselessness.
Read more

If I really need a card on my start hand, how many mulligans make sense? [duplicate]

Image
5 This question already has an answer here: How do you calculate the likelihood of drawing certain cards in your opening hand? 3 answers There is a funny modern deck where you play Treasure Hunt, but you really need to have it on the starting hand. How many mulligans should I take, if my deck contains 60 cards and contains 4 copies of Treasure Hunt? magic-the-gathering probability share | improve this question asked Nov 23 '18 at 12:12 dan dan 152 4
Read more

Alcedinidae

Image
Alcedinidae Martin-pêcheur à dos bleu ( Alcedo azurea ) Classification (COI) Règne Animalia Embranchement Chordata Sous-embr. Vertebrata Classe Aves Ordre Coraciiformes Famille Alcedinidae Rafinesque, 1815 Les Alcédinidés ou Alcedinidae forment une famille d'oiseaux plus connus sous les noms de martins-pêcheurs et martins-chasseurs. Sommaire 1 Description 2 Répartition et habitat 3 Systématique 3.1 Liste alphabétique des genres 3.2 Liste des espèces 4 Chez les Anciens : l'alcyon 4.1 Étymologie (Littré) 4.2 Oiseau « fabuleux » ? 5 Notes 6 Articles connexes 7 Liens externes 7.1 Bibliographie Description | Ce sont des oiseaux compacts de taille petite à moyenne (10 à 46 cm), au bec droit et long, en forme de poignard. Leurs pattes sont courtes, et ils portent un plumage aux couleurs vives. Répartition et habitat | Cosmopolites, ils fréquentent surtout
Read more