Q: iMac won't wake up from sleep
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Mar 23, 2016 1:59 PMby norm123,Hey ronymrad,
I understand that you are having issues with your iMac not waking from sleep. Let's see if we can get this sorted out.
I would start with making sure that your iMac is not in safe sleep. Press the power button on the back to see if it wakes up then. If that does not work, take a look at the information below for more details on how to troubleshooting this further.
If your Mac doesn‘t sleep or wake when expected
https://support.apple.com/en-us/HT204760
If your Mac doesn't wake when you expect
Your Mac might pause a few seconds before it wakes up. If it doesn't seem to wake at all, check for these possibilities:
- Your screen brightness might be turned down.
- If you're using an external display, your display might be turned off.
- Your Mac might be in safe sleep. To wake from safe sleep, press the power button.
- Check for a sleep indicator light, if applicable, and make sure that your Mac isn't turned off.
If the previous steps don't work
These additional steps may help identify or resolve the issue:
- Reset the SMC.
- Reset NVRAM.
- Disconnect external devices other than your Apple keyboard, mouse, and display. If that resolves the issue, gradually reconnect your devices, testing each time, until you find the device that is interfering with sleep. Then check the documentation that came with the device, or contact the device manufacturer.
- Start up in Safe Mode to see if the issue is related to non-Apple startup items, login items, or kernel extensions.
- Try to isolate the issue by using another user account.
Take it easy -
Mar 25, 2016 4:59 AMby ronymrad,Thanks norm123 for your reply.
however i have tried all the above and inhave reset SMC and NVRAM but nothing has changed.
also i have updated to the latest OS X El Capitan 10.11.4 but it is still the same.
i have run a hardware test and it said no errors found.
i am really annoyed and i dont know what i can make more. everytime i need to work on my imac i should remove the power cord and reconnect it again.
apple support in my country said to change my UPS to an Online UPS but the apple online support said that this is not related to my issue.
please anyone can help?
many thanks
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Mar 25, 2016 6:11 AMby norm123,Hi ronymrad,
Have you tried testing your sleep issue in a new user as it might not be waking up because of some user setting. Take a look at the next article for the details on that.
How to test an issue in another user account on your Mac
https://support.apple.com/en-us/HT204443
Have a good day -
Mar 26, 2016 6:39 AMby norm123,Hello ronymrad,
At that point, if it is still not waking from sleep, something further is going on. I would probably move on to reinstalling OS X. I would make sure that you have a safe copy of your data first. After you have reinstalled OS X and it is still giving you issues, you will want to contact Apple Support for further assistance as it could be hardware. The links below will help you out from here.
How to reinstall OS X on your Mac
https://support.apple.com/en-us/HT204904
Contact Apple Support
https://www.apple.com/support/contact/
Take care
