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Q: iMac not booting after upgrade to Yosemite

I have upgraded to Yosemite yesterday and since finishing off the installation with powering down I am unable to reboot the machine. It powers up with the music cord, then the boot bar to the bottom appears, but after about 5-8% of the bar the things shuts off - black screen. I've tried to start in Safe Mode - nothing. I've tried with cmd-v to check the boot protocol and at one point it shuts off. Any idea? HDD dead?

iMac, iOS 8.0.2

Posted on Oct 18, 2014 7:54 AM

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Q: iMac not booting after upgrade to Yosemite

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  • by Steve Maser,

    Steve Maser Steve Maser Mar 24, 2015 11:44 AM in response to Cerealhunter
    Level 1 (10 points)
    Mar 24, 2015 11:44 AM in response to Cerealhunter

    I can not publicly say what I have/have not heard from Apple.

     

    However, until such time as something would be announced publicly, we are using the "BootCacheControl jettison" workaround here fairly successfully.

  • by Ace1193,

    Ace1193 Ace1193 Apr 15, 2015 6:38 AM in response to memaxx
    Level 1 (4 points)
    Apr 15, 2015 6:38 AM in response to memaxx

    I find this so pathetic... we have 180 macs in our company and each time we do an upgrade the Yosemite macs are affected.

    Surely we should get an official workaround from Apple?

     

    And with the release of 10.10.3 and if theres no fix... come one- WE as Enterprises/ schools can't get messed around like this!

  • by Steve Maser,

    Steve Maser Steve Maser Apr 15, 2015 6:59 AM in response to Ace1193
    Level 1 (10 points)
    Apr 15, 2015 6:59 AM in response to Ace1193

    10.10.3 fixes the problem with AD-bound macs hanging at boot.

     

    At least here (and a number of places that also had the same problem...)

  • by thomasfromkamuela,

    thomasfromkamuela thomasfromkamuela Sep 22, 2015 6:53 PM in response to memaxx
    Level 1 (0 points)
    Sep 22, 2015 6:53 PM in response to memaxx

    I don't know if this thread is still active but this problem recently occurred (long after upgrading to Yosemite, but just after installing a new app and its driver) and have tried the Hotte suggestion bit the boot still hangs. If I do a verbose boot, the sequence goes past not finding BootCache and then just stops and goes no further. Any suggestions for something else to try?

    Thanks

  • by Ace1193,

    Ace1193 Ace1193 Sep 23, 2015 1:52 PM in response to thomasfromkamuela
    Level 1 (4 points)
    Sep 23, 2015 1:52 PM in response to thomasfromkamuela

    HI there,

     

    ive had experiences wimath booting whilst holding "V" which worked.

    But ive also separate experiences with holding "S" when booting.

     

    Have you tried both, separately??

     

    Cheers

  • by thomasfromkamuela,

    thomasfromkamuela thomasfromkamuela Sep 24, 2015 2:32 AM in response to Ace1193
    Level 1 (0 points)
    Sep 24, 2015 2:32 AM in response to Ace1193

    Hi Ace1193, thanks for the response.  I have tried command S and command V separately and I've tried every suggestion I found on the net.  Finally I tried the suggestion to re-install the OS and that worked, I was able to boot into Yosemite.  However, I have not yet tried to reboot so whether that will work is yet to be discovered.

  • by Ginger3,

    Ginger3 Ginger3 Sep 29, 2015 11:22 AM in response to dirty_south173
    Level 1 (0 points)
    Sep 29, 2015 11:22 AM in response to dirty_south173

    It is unbelievable that after 1 year neither this problem has been solved nor there is official information about it. I upgraded to Yosemite yesterday and your post saved my sanity. After trying to find a solution for hours I unplugged the Ethernet cable and it worked! Thank you so much!

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