fredfrommccormick

Q: Mac won't start up. Screen shows grey circle with a slash through it

My friend has a Mac that won't start up. Screen shows grey circle with a slash through it

MacBook Pro with Retina display, OS X Yosemite (10.10.1), New 2013 model 15inch, 1 T SSD

Posted on May 30, 2016 5:25 AM

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Q: Mac won't start up. Screen shows grey circle with a slash through it

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  • Helpful answers

  • by D.Cohen,

    D.Cohen D.Cohen May 30, 2016 5:25 AM in response to fredfrommccormick
    Level 6 (8,424 points)
    Desktops
    May 30, 2016 5:25 AM in response to fredfrommccormick

    Take a look at the steps suggested by Apple in this article:

    If your Mac won't turn on - Apple Support


    Try Safe Boot:


    - Shut down your Mac

    - Wait until your computer turns off and after that press the Power button

    - Right after you hear the startup tone, press and hold the Shift key

    - Release the Shift key when you see a grey Apple sign and the progress bar below this sign

    - After your Mac boots up, restart it as you usually do.


    If this doesn't help, follow the instructions below:


    - Shut down your Mac

    - Wait until your computer turns off and after that press the Power button

    - Right after you hear the startup tone, press and hold the Shift key

    - Release the Shift key when you see a grey Apple sign and the progress bar below this sign

    - Once you see Desktop, start a Disk Utility scan to detect and repair file system errors (don't forget to choose your main hard drive)

    - Click on Verify Disk and then, if asked to fix problems, on Repair Disk

    - After this, click on Verify Disk Permissions and then on Repair Disk Permissions

    - After the process is finished, shut down your Mac and turn it back on after about 30 seconds


    Apart from that, take a look at this Apple article and follow the instructions on Resetting NVRAM shown there: How to Reset NVRAM on your Mac - Apple Support


    Try resetting the System Management Controller: https://support.apple.com/en-us/HT201295


    Hope this helps!

  • by OGELTHORPE,

    OGELTHORPE OGELTHORPE May 30, 2016 7:07 AM in response to fredfrommccormick
    Level 9 (52,313 points)
    Mac OS X
    May 30, 2016 7:07 AM in response to fredfrommccormick

    If this is what you are seeing, follow the Apple instructions:

    Screen Shot 2016-05-30 at 10.06.11 AM.png

    Ciao.