Imac turning off repeatedly
After updating to Yosemite my imac unexpectedly turns off and it happens very often. Does anybody know what could be the issue?
iMac, OS X Yosemite (10.10.3)
After updating to Yosemite my imac unexpectedly turns off and it happens very often. Does anybody know what could be the issue?
iMac, OS X Yosemite (10.10.3)
Which model iMac do you have?
CLICKY CLICK---> http://support.apple.com/kb/HT1758How to identify iMac models
User Tip: https://discussions.apple.com/docs/DOC-3603 iMac SMC and PRAM reset
http://support.apple.com/kb/HT3964Intel-based Macs: Resetting the System Management Controller (SMC)
http://support.apple.com/kb/HT1379Resetting your Mac's PRAM and NVRAM
Run Apple Hardware Test.
==========
If you are still under warranty and/or have AppleCare, call them. Let them deal w/it.
Thanks a lot for your help.
I will try to reset the PRAM and NVRAM
The Apple hardware test didn't identify any errors.
My Imac is from january 2013.
These instructions must be carried out as an administrator. If you have only one user account, you are the administrator.
Launch the Console application in any of the following ways:
☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
☞ Open LaunchPad and start typing the name.
In the Console window, select
DIAGNOSTIC AND USAGE INFORMATION ▹ System Diagnostic Reports
(not Diagnostic and Usage Messages) from the log list on the left. If you don't see that list, select
View ▹ Show Log List
from the menu bar.
There is a disclosure triangle to the left of the list item. If the triangle is pointing to the right, click it so that it points down. You'll see a list of reports. A panic report has a name that begins with "Kernel" and ends in ".panic". Select the most recent one. The contents of the report will appear on the right. Use copy and paste to post the entire contents—the text, not a screenshot.
If you don't see any reports listed, but you know there was a panic, you may have chosen Diagnostic and Usage Messages from the log list. Choose DIAGNOSTIC AND USAGE INFORMATION instead.
In the interest of privacy, I suggest that, before posting, you edit out the “Anonymous UUID,” a long string of letters, numbers, and dashes in the header of the report, if it’s present (it may not be.)
Please don’t post other kinds of diagnostic report.
I know the report is long, maybe several hundred lines. Please post all of it anyway.
When you post the report, you might see an error message on the web page: "You have included content in your post that is not permitted," or "The message contains invalid characters." That's a bug in the forum software. Please post the text on Pastebin, then post a link here to the page you created.
Thanks for your answer, Linc but unfortunately I couldn't find the files you mentioned. I opened the console and on the left side I visualized
Diagnostic and Usage Information
Diagnostic and Usage Messages
- (it is a triangle pointing to the right) User Diagnostic Reports
- (it is a triangle pointing to the right) System Diagnostic Reports (the one you mentioned). I clicked the triangle to point it down but the list of reports does't contain any file beginning with "Kernel" nor ending with ".panic".
Do you think I should reinstall the whole system?
Thanks for your help.
Regards
What exactly happens when it "turns off?"
It only turns off when in sleep mode.
I always leave the imac on sleep mode when I stop working.
And a few hours later, when I try to use it, the computer is turned off.
So I always have to turn it on again.
Step 1
Take all the applicable steps in this support article. That's the starting point for any further efforts to solve the problem. Please read the whole article carefully and don't skip any of the steps, including the ones under the heading Learn more. If you don't understand any of the steps, ask for guidance.
Also note that if you replaced the internal hard drive with an SSD, or if you're starting up from an external SSD, then that device may be causing the problem. Check the SSD manufacturer's website for a firmware update. The only solution may be to reinstall the original drive or avoid sleep altogether.
Step 2
If you're running OS X 10.8.5 or earlier, from the menu bar select
▹ System Preferences... ▹ Accessibility
If the checkbox at the bottom marked
Enable access for assistive devices
is checked, uncheck it and test.
If you're running OS X 10.9 or later, select
▹ System Preferences... ▹ Security & Privacy ▹ Privacy ▹ Accessibility
If any applications are listed on the right and have a checked box next to them, uncheck all the boxes and test. You may first have to click the padlock icon in the lower left corner of the window and authenticate as an administrator to unlock the settings.
Step 3
In the Energy Saver pane of System Preferences, uncheck the box marked
Put hard disks to sleep when possible
Step 4
If you don't already have a current backup, back up all data, then reinstall the OS.* You don't need to erase the startup volume, and you won't need the backup unless something goes wrong. If the system was upgraded from an older version of OS X, you may need the Apple ID and password you used.
If you installed the Java runtime distributed by Apple and still need it, you'll have to reinstall it. The same goes for Xcode. All other data will be preserved.
*The linked support article refers to OS X 10.10 ("Yosemite"), but the procedure is the same for OS X 10.7 ("Lion") and later.
Step 5
This and the next step must be taken as an administrator. If you have only one user account, you are the administrator.
Launch the Console application in any of the following ways:
☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
☞ Open LaunchPad and start typing the name.
In the Console window, select
DIAGNOSTIC AND USAGE INFORMATION ▹ Diagnostic and Usage Messages
In the search box in the window's toolbar, enter "powerd" (without the quotes.)
You may see one or more lines like this:
com.apple.message.signature: Platform Failure
If you do see that, and you did everything in the preceeding steps, then you're dealing with an internal hardware fault. Make a "Genius" appointment at an Apple Store, or go to another authorized service provider.
Step 6
In the Console window, select
DIAGNOSTIC AND USAGE INFORMATION ▹ System Diagnostic Reports
(not Diagnostic and Usage Messages) from the log list on the left. If you don't see that heading, select
View ▹ Show Log List
from the menu bar.
There is a disclosure triangle to the left of the list item. If the triangle is pointing to the right, click it so that it points down.
You may see one or more reports with a name that begins with "Sleep Wake Failure" followed by a date. Select the most recent one. The contents of the report will appear on the right. Use copy and paste to post the entire contents—the text, not a screenshot.
I know the report is long, maybe several hundred lines. Please post all of it anyway.
Problem solved.
I unchecked the "Put hard disks to sleep when possible" and reinstalled the OS and the issue hasn't happened so far.
Thanks a lot.
Imac turning off repeatedly