robindewaal
Level 1 (0 points)

Q: iMac not responding on black screen

Can somebody help me with the problem that after my iMac has been on all night and when i try to work on it the next the day it stays on a black screen and cannot get it out of the black screen mode anymore (no mouse cursor shown). I can hear the iMac is still on. iMac doesn't respond on mouse or keyboard clicks and only shutting iMac off by holding power button to shut it down and start it again by hitting power button helps.

 

Under here the details of my iMac:

iMac (27-inch)

3,2 GHz Intel Core I5

8 GB 1600 MHz DDR3

C0*****8J4

 

What i already tried is:

- Deactivated screensaver

- Option to turn on hibernation after screen is turned off (after 45 min)

 

<Personal Information Edited by Host>

iMac, OS X Yosemite (10.10.1), null

Posted on Jan 7, 2015 12:30 PM

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robindewaal

Q: iMac not responding on black screen

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  • by alex_h1,

    alex_h1 alex_h1 Jan 7, 2015 11:16 AM in response to robindewaal
    Community Specialists
    Jan 7, 2015 11:16 AM in response to robindewaal

    Hello robindewaal,

     

    Thanks for using Apple Support Communities.

     

    To troubleshoot this issue where your iMac will not wake from sleep, please follow the troubleshooting in the article linked to below.

     

    Reset SMC

    The System Management Controller (SMC) is involved in managing power on your computer. Reset the SMC on your Mac if you are having difficulty sleeping or waking your computer.

    Reset NVRAM/PRAM

    Nonvolatile RAM (NVRAM)/Parameter RAM (PRAM) stores some power-related settings.Try resetting NVRAM/PRAM if you are having difficulty sleeping or waking your computer.

    Test with external devices disconnected

    Some external devices can prevent your computer from sleeping. Try disconnecting items other than your Apple keyboard or mouse from the built-in USB, Thunderbolt and Firewire ports on your Mac. If this resolves the issue, try reconnecting your external devices one at a time until you find the device preventing sleep or wake. Check the documentation that came with the device, or contact the device manufacturer for more information.

    Try Safe Mode

    Check to see if the issue still occurs when the computer is started in Safe Mode. If this resolves the issue, it could be related to a third party software item such as:

    Try another user account

    Try creating another user account, or log in as guest. See if your computer sleeps and wakes properly from the additional user account. If it does, your issue may be related to one of the following:

    You can disable login items from the Accounts pane of System Preferences. Try opening only one app at a time in the original user account to determine which app is preventing sleep. If you isolate the issue to a particular app or login item, check its documentation, or contact the developer of that software for more information.

     

     

    OS X: When your Mac doesn't sleep or wake - Apple Support

     

    Thanks for using the Apple Support Communities!

     

    Cheers,

    Alex H.

  • by Baby Boomer (USofA),

    Baby Boomer (USofA) Baby Boomer (USofA) Jan 7, 2015 12:31 PM in response to robindewaal
    Level 9 (57,623 points)
    Jan 7, 2015 12:31 PM in response to robindewaal

    Due to security reasons, NEVER post serial #s on a public message board.  Will notify a HOST to remove/edit.

     

     

     

     

     

     

     

     

     

     

     

     

     

     

     

     

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